The suspect, dressed in dark trousers and shirt, walks down the Mall

The video shows a grey Saab stopping near traffic lights on The Broadway at 2300BST - an hour before the bomb exploded.

A few minutes later the man police believe is the bomber is seen walking down The Mall towards Ealing Common.

Outside a shop he appears to brush past two men who police believe may have exchanged words with him.

The other two people in the picture had just left the Royal food and wine shop.

Deputy Assistant Commissioner Alan Fry, head of the anti-terrorist branch, said: "There may have been something said between them.

"It looks like he almost bumps into someone and someone said 'look where you are going'."

Click here to see a map of suspect's route

Police hope the footage will jog the memory of the pair, and of anyone else in the area.

The video shows a group of eight young people walking past the car just 10 minutes before the blast, who the police say are "incredibly lucky to be alive".

The footage also showed the explosion, just minutes after a group of pedestrians walked past

Police also hope the video will jog the memory of drivers.

They say the car, which had its lights left on, was parked so close to the traffic lights on The Broadway that cars turning left had to manoeuvre round it.

Police say they can tell from the pictures that the man was wearing a dark short-sleeved shirt, dark trousers and a baseball cap with a white motif.

Mr Fry said: "I would not expect anyone to be able to name the bomber from what we see here.

"This is not the breakthrough that we are looking for, that's still to come."

Back to normal

On Monday residents and traders in the area were trying to get back to normal.

Some shops in Ealing remain behind police lines

Some were allowed to return to their properties, but others were told they would have to stay away for some time.

The council said the section of the road where the bomb exploded would need to be closed "for the foreseeable future", although the station itself is open.

On Monday evening anti-terrorist officers completed their search of the immediate area around the bomb site.

Police allowed the press to survey the area. The blast had left a crater 10ft square and about 4ft deep.

Shop fronts in the immediate vicinity were completely destroyed and stock still littered some interiors.

A spokeswoman for Ealing Hospital has confirmed that a 28-year-old man, who had been treated for shoulder injuries, would be released later on Monday.

Anyone with information about the bombing is urged to contact police on 0800 789321.