Theresa May, the UK home secretary, has said measures are in place to offer military support to the police if there is a  Paris-style terror attack.

Speaking on the BBC's Andrew Marr show, Ms May refused to confirm a Sunday Times report that SAS counter-terror troops had been flown by helicopter to RAF Northholt in West London from their usual base in Hereford.

Echoing comments yesterday by Metropolitan Police Commissioner Sir Bernard Hogan-Howe, she said that UK police had been trained to react to the kinds of urban attacks seen in Paris, and in Mumbai in 2008.

Ms May also reiterated Britain's solidarity with the French, saying the two countries stand "shoulder to shoulder".  

Several Kalashnikov rifles were found in an abandoned car believed to have been used by the Paris attackers, reports French news agency AFP, quoting judicial sources.

The car was found on Sunday morning in the Paris suburb of Montreuil, following eyewitness descriptions of a vehicle used by gunmen who attacked a cafe on the Rue Fontaine-au-Roi and a restaurant on Rue de Charonne.

The find is likely to increase suspicion that a number of attackers escaped. Police have yet to say whether they believe any suspects are still at large.  

The holder of the Syrian passport found at the scene of the Stade de France attack crossed into Serbia on October 7, where he sought asylum, according to Serbia's interior ministry.

"One of the suspected terrorists, A.A., who is of interest to the French security agencies, was registered on the Presevo border crossing on October 7 this year, where he formally sought asylum," the ministry said in a statement. 

The Presevo border crossing separates Serbia from Macedonia. 

"Checks have confirmed that his details match those of the person who on October 3 was identified in Greece. There was no Interpol warrant issued against this person." 

Greek authorities had said on Saturday the passport matched one used by a refugee who arrived on the Greek island of Leros on October 3.

However, French authorities have not confirmed whether the passport is real, and it is not known at this stage whether the same person who used it to pass through Greece was the person involved in the Paris attacks.  

European Union countries should not give in to "basic reactions" of rejecting refugees after the Paris attacks, the head of the European Commission, Jean Claude Juncker, has warned.

Mr Juncker's statement comes after reports that a Syrian passport found near the body of one of the attackers was used to register on the Greek island of Leros in October.

The legitimacy of the passport has not been verified, and it is not known whether the same person who used it to pass through Greece was the person who was involved in the Paris attacks.

"We should not mix the different categories of people coming to Europe," Mr Juncker told a news conference on the sidelines of a G20 summit.

"The one responsible for the attacks in Paris ... he is a criminal and not a refugee and not an asylum seeker," he added.

You can follow all of the BBC correspondents covering the Paris attackshere, external.

Guns have been found in a black Seat car believed to have been used by the attackers, France's BFM TV reports.

The reports have not been confirmed by police.

The car was found on Sunday morning in the Paris suburb of Montreuil, following eyewitness descriptions of a vehicle used by the gunmen.

For anyone still uncertain about the whereabouts of loved ones, the French government has set up a hotline for information: 0800 40 60 05 (within France). 

There is also a website, external where missing persons can be registered. The interior ministry warns that the site is frequently overloaded and may be unavailable at times.

The ministry also posted a list, external of useful websites and social media accounts (in French).

The hashtags #rechercheParis (searching Paris) and #rechercheBataclan are being used widely to circulate the names and photos of the missing. There is also a Twitter account: @recherche_Paris, external.

A Facebook page, Je Suis Charlie, external, set up after the deadly Charlie Hebdo attacks in Paris in January, is posting pictures and asking for information about people who have not been seen since Friday evening.  

French police are still advising people to stay at home as much as possible, according to the BBC's Europe editor Katya Adler. 

Police have also asked people to refrain from making prank calls or using fireworks.

A police helicopter was dispatched to the Parisian suburb of Bagnolet on Saturday after firecrackers set off at a wedding were mistaken for gunfire.

French gunman Omar Ismail Mostefai was radicalised by Belgian imam, according to French media reports. 

Six people close to Omar Ismail Mostefai, who took part in the killings at the Bataclan concert hall and the first of Friday's attackers to be identified, have been detained, according to French news agency AFP.

They include Mostefai's father, brother, and sister-in-law.

A black Seat car used by gunmen in the attacks has been found in the eastern Paris suburb of Montreuil, AFP reports.

Police put out an alert about the vehicle on Saturday and warned both police officers and the public not to approach the vehicle.

Police feared that the occupants were heavily armed and the car may have been rigged with explosives.

One of the assailants who detonated a suicide bomb by the Stade de France attempted to enter the stadium, according to a report by the Wall Street Journal.

The report says the suicide bomber was turned away by stadium security ahead of the friendly between France and Germany, which was attended by French president Francois Hollande.  

From the WSJ:

"The guard—who asked to be identified only by his first name, Zouheir—said the attacker was discovered wearing an explosives vest when he was frisked at the entrance to the stadium about 15 minutes into the game. France was playing an exhibition against Germany inside.

"While attempting to back away from security, Zouheir said, the attacker detonated the vest, which was loaded with explosives and bolts, according to Paris prosecutor François Molins. 

Read the full story here, external.

Candlelit vigils have been held and landmarks illuminated around the world in solidarity with the victims and residents of Paris.People gathered in London's Trafalgar Square overnight, where the French national anthem and other French songs were sung. Similar vigils were held in Berlin, Moscow, Sydney, Rio, and elsewhere. 

Several of London's landmarks including Tower Bridge and the London Eye were lit up in the tricolour colours of the French flag, following the example of the Sydney Opera House, One World Trade Centre, Arc de Triomphe and many others around the world yesterday.

Image source, Reuters

Image source, AP

Image source, Reuters

Grim footage has emerged online of the moment the gunfire erupted at the Bataclan concert hall, where the Eagles of Death Metal were mid-set. 

The footage is not graphic.

Omar Ismail Mostefai, the attacker identified by French media, came from the town of Courcouronnes, 25km (15 miles) south of Paris. He lived in the nearby town of Chartres until 2012, according to the deputy mayor, Jean-Pierre Gorges.

Mostefai had a history of petty crime but was never jailed. The security services deemed him to have been radicalised in 2010 but he was never implicated in a counter-terrorism investigation.

Mostefai's older brother said he had not had contact with him for several years following a family dispute, but said he was surprised to hear he had been radicalised.

"It's crazy, insane. I was in Paris myself last night, I saw what a mess it was," Mostefai's older brother told AFP before voluntarily attending a police station on Saturday.

Mostefai was one of six children in the family and had travelled to Algeria with his family and young daughter, the brother said.