PASSENGERS faced a nightmare scenario today when they were faced with a full-scale emergency on the London underground.Commuters from Ipswich were arriving at London's Liverpool Street station on mainline trains minutes after a "bang" was heard on the Metropolitan underground line at Aldgate Station.

PASSENGERS faced a nightmare scenario today when they were faced with a full-scale emergency on the London underground.

Commuters from Ipswich were arriving at London's Liverpool Street station on mainline trains minutes after a "bang" was heard on the Metropolitan underground line at Aldgate Station.

Kesgrave man David Jimpson, who was travelling to work as an insurance broker near the Tower of London, arrived at Liverpool Street at 8.55am, just six minutes after the first reports of an explosion.

The tube lines were already closed but Mr Jimpson described how the emergency operation was already in full swing.

Mr Jimpson, 45, of Rayment Drift, said: "Police cars were racing about, there was a dog squad and there were police motorcycles racing about.

"There was obviously something going on.

"There was a lot of noise of police cars travelling down the roads."

The train from Ipswich, which arrived at 8.55am, was carrying dozens of passengers from Ipswich commuting to their jobs in London. At that time the station mainline station had not been fully evacuated.

Mr Jimpson said: "The station was still full of people."

Other stunned passengers told of the horror situation they faced at Edgeware Road station.

One commuter speaking to Sky News said he was on the Circle Line heading into Edgeware Road when there was a bang and everything went black.

He said: "There was some kind of explosion. Everything went black and it felt like we had grazed or hit an oncoming train.

"There was debris all over the place. We were evacuated within around 15 minutes."

Another commuter called Steve was on a train at the platform when they heard the bang. Within two minutes staff had him and other passegers evacuated and it was only then that they realised a major incident had happened.

He told Sky News: "We were just on a train on the platform. About two minutes after the noise they told us all to leave and we all did.

"There were people coming out with soot on their hands and soot on their faces.

"People were coming out crying, quite shocked. I realised something must have happened."

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