Pinar Ersoy
BBC Turkish Service

We still don't know who is responsible for the attack on a state-owned defence and aerospace company outside the Turkish capital.

But today's attack has taken place amid a debate in Turkey about reigniting peace talks with the PKK – a Kurdish militant group, banned as a terrorist organisation in Turkey, the US and UK.

It also comes a day after government-ally Devlet Bahceli said PKK leader Abdullah Ocalan should announce the outlawed group’s "abolition" in parliament, which would suggest his release from prison.

Bahceli is a key player in Turkish politics, and his suggestion is considered to be significant given his opposition to previous peace talks.

The PKK has been fighting an insurgency against the Turkish state for greater rights for the country’s significant Kurdish minority since the 1980s.

Ocalan, who founded the group, was arrested in 1999 and has been in a high security prison since.

A reminder: no group has claimed responsibility for the attack and few details about the nature of the incident have been confirmed.

• Four people have been killed and 14 wounded after attackers opened fire at a Turkish aerospace company near the capital, Ankara, in what officials are describing as a "terrorist attack"
• Two suspects - one man and one woman - have been "neutralised", Turkey's interior minister says. It's not clear whether other people were involved
• CCTV footage appears to show a gunman firing an assault rifle inside a Turkish Aerospace Industries building
• Turkish President Recep Tayyip Erdogan says he "condemns this vile terror attack", with other countries saying they stand in "solidarity" with Turkey
• One local journalist has told the BBC that relatives of employees are waiting near the building "trying to get information about their loved ones"

Turkish Aerospace Industries' general manager began making his way back to Ankara after news of the attack broke, according to Anadolu news agency.

It says Mehmet Demiroglu was at a high-profile defence fair in Istanbul at the time, but swiftly left with the rest of his delegation.

Germany - which has a large Turkish population - says its "solidarity goes out to our Turkish friends".

"We condemn all forms of terrorism in the strongest possible terms," the German foreign ministry says in a post on X.

The ministry says its embassy in Ankara and crisis response centre in Berlin are "monitoring the currently evolving situation very closely".

The US Embassy in Turkey has also posted on X, expressing its condolences to the families "of those lost and injured".

We've also heard from the Greek government. Its ministry of foreign affairs says that the attack should be "unequivocally condemned" and extends its condolences to victims' families.

Meanwhile, the UK embassy in Turkey says it "stands in solidarity" with its ally.

The mayor of Ankara says he is "deeply saddened" by the attack on the Turkish Aerospace Industries facility.

In a post on X, Mansur Yavas says he "wishes a speedy recovery" to the wounded.

"We condemn terrorism," he adds.

More now from Turkish president Recep Tayyip Erdogan, who says the attack on the Turkish Aerospace Industries (TAI) headquarters is a “vile attack targeting the survival of our country”.

In a lengthy statement recently shared on X, Erdogan stresses that security forces acted quickly to neutralise the threat.

"No terrorist organisation, no evil focus targeting our security will be able to achieve their goals," he says.

The president, who is currently meeting with Vladimir Putin at the Brics summit in Russia, says that he extends his best wishes to the employees of TAI, who he says are “the source of pride of our defence industry”.

Image source, BRICS-RUSSIA2024.RU/Reuters

Turkish president Recep Tayyip Erdogan has decried the attack, saying: "We have four martyrs and 14 wounded. I condemn this vile terror attack and wish God's mercy on our martyrs."

He made the comments while on a visit to Russia, where he is attending a summit hosted by President Vladimir Putin.

Erdogan headed to the Russian city of Kazan earlier today for the Brics summit of emerging economies, that includes India and China.

Speaking at the event, Putin condemned the attack on the aviation company near Ankara and expressed his "condolences", according to Reuters news agency.

We now have more on our earlier report about difficulties accessing social media sites.

A woman in Bodrum, western Turkey, has told the BBC she's facing the same problem.

"After the [attacks], the government restricted some social media apps such as X and Instagram […] and so we are using VPN applications to use these sites to get some information about what happened in Ankara,” she says.

We are still yet to hear from the Turkish government officially about any restrictions, but earlier, the Chairman of Turkey’s Radio and Television Supreme Council (RTÜK), Ebubekir Şahin, expressed his concern that "unconfirmed information" is circulating on social media.

At the scene "many people are waiting in front of the company, with the relatives of employees trying to get information about their loved ones", says one local television journalist.

Mevlut Isli tells BBC OS that it "is a major incident", with "a large number of ambulances" currently at the site.

We've received what appears to be CCTV footage of a gunman firing his weapon inside a Turkish Aerospace Industries building.

He is wearing a rucksack and armed with what appears to be an assault rifle, shooting through sliding doors at the entrance to a building in the complex. Watch below:

What happened

• Gunfire and explosions have been reported outside the Turkish Aerospace Industries (TAI) headquarters
• Turkish officials are describing this as a "terrorist attack"

Four people killed

• Four people have been killed, with 14 wounded, officials say
• Two suspects - one man and one woman - have been "neutralised," Turkey's interior minister says

What is Turkish Aerospace Industries?

• TAI is a state-owned arms and aerospace technology company in Turkey, located in Kahramankazan, about 17 miles (28km) north-west of Ankara

What we don’t know

• Who is behind the attack, although you can read analysis from Frank Gardner
• Exactly how many attackers were involved

Unclear whether suspects pictured in viral videopublished at 16:52 British Summer Time

16:52 BST

By Nick Eardley and Joshua Cheetham

When incidents like this happen, BBC Verify looks at footage being posted online to figure out what is real and build up a picture of what's happened.

There is a lot material being circulated from this attack which we're working through.

One video we have verified so far is filmed at a car park at the Turkish Aeropace Industries (TAI) building, just outside the capital Ankara.

A few seconds in, you can see and hear explosion under a distinctive part of the building – which is how we verified the location video.

Then, about 16 seconds into the video you can see what looks like a man with a large gun and a big pack moving into the shot.

He moves forward, then turns around. We can't be sure at the moment if this was one of the people responsible for the attack due to the video quality and how far away they are.

There is more dramatic footage from the complex which we're working to verify at the moment.

We've got you an update on the casualties from the attack.

Turkey's interior minister, Ali Yerlikaya, has stated that the death toll from the attack has risen to four.

Fourteen people are injured, as we've reported earlier. However, Yerlikaya also mentions that three of the injured are in a serious condition.

He adds that the two "terrorists" previously reported as "neutralised" are one female and one male.

Paul Adams
Diplomatic correspondent

It’s not clear whether the Turkish interior minister’s statement that two "terrorists" had been "neutralised" means the incident involved only two people or more than that.

Videos circulating on social media show two attackers, both carrying rucksacks and heavily armed, arriving at the gates of the facility in what appears to be a yellow taxi.

They immediately open fire on pedestrians outside the gates, before entering the building.

"I condemn this heinous attack," Ali Yelikaya says. "Our fight will continue with determination and determination until the last terrorist is neutralised."

A sudden blast is seen after a series of gunshots at the scene of the incident

Rushdi Abualouf
Reporting from Istanbul

At 17:48 Turkish time (15:48 BST), users in large areas of Turkey complained about their inability to use social media sites YouTube, Instagram, Facebook and Twitter.

More from the Turkish government.

The Ankara chief public prosecutor’s office has started a judicial investigation into the attack, according to Yılmaz Tunç, Turkey's justice minister.

He mentions in a post on X that one deputy chief public prosecutor and eight public prosecutors have been assigned to the case.

Image source, EPA

We're now starting to hear from international leaders.

Mark Rutte, Nato's secretary general, has posted on X, describing the report on the attack as "deeply concerning".

He says:

Key question is which group might be behind this attackpublished at 16:14 British Summer Time

16:14 BST

Frank Gardner
Security correspondent

Turkey is no stranger to attacks branded as terrorism.

Historically, these have mostly been blamed on Kurdish separatists, whose camps in northern Syria and elsewhere in the region have come under repeated airstrikes from the Turkish air force.

But the Islamic State group (IS) is also present in Turkey and then there is the question of the Turkish aerospace industry which produces drones that have changed the entire course of a war between Armenia and Azerbaijan.

In the early stages of Russia’s full-scale invasion of Ukraine, the latter made large use of Turkish-made Bayraktar drones to target Russian tanks before Ukraine began mass producing its own drones.

So the key question now, as the investigation into this attack gets under way, is who would benefit from doing this and why?