In pictures: Parsons Green Tube train 'terror' blast

An explosion on a Tube train in south-west London injured a number of people.

Witnesses reported panicked scenes as a result of the blast at 08:20 BST at Parsons Green station on the District Line on Friday.

A white bucket inside a supermarket bag was photographed inside the carriage, although it did not cause extensive damage.

Police are treating it as a terror attack.

An 18-year-old was arrested at the port of Dover on Saturday morning in connection with the incident.

The station reopened on Saturday morning

Armed police are patrolling Tube stations while the national threat level has been raised to critical

Soldiers are helping to patrol key buildings such as Buckingham Palace so that armed police officers can patrol the Tube

Emoji-filled hearts were on display in a local estate agent's window to show support for the area

Hundreds of commuters fled from Parsons Green station on Friday morning after the explosion, with witnesses reporting a stampede

Some travellers were stuck on trains that were stopped after the explosion

The ambulance service said a number of people had been injured, but none had sustained serious or life-threatening wounds. This woman was photographed as she was escorted from the scene by a police officer

It was not clear on Friday how many of those injured were hurt by the blast and how many were caught up in the "crush" as people fled the station

Staff from a local Italian restaurant handed out pizzas and bottles of water to members of the emergency services

Access to local homes and businesses was being strictly controlled by the Met Police, which set up a cordon around the area

A white bucket on fire inside a supermarket bag was seen on the District Line train. One passenger told the BBC there was a "really hot intense fireball above my head" when it ignited

Armed police and forensics officers were seen examining train carriages

Sniffer dogs were also sent to the scene