Warren Street
Abena Adofo, a TV researcher, who was also on the Victoria Line train, said she knew something wrong when the train was coming into Warren Street and she saw people were running into her carriage.
"Lots of people just burst into our carriage and it just became full up with people, I didn't see smoke , I just smelt smoke," she said.
They all got off when the train reached the station. "Some people were panicking and screaming."
When the train reached the station, she said: "People still did not know what was going on, some people did try to get on to the train on the opposite platform.
Oval Tube station
I was talking to a young woman a while ago who said that she was in the carriage, she heard a fuss being made at one end, a young man got off at the station and ran away.
At the same time she said she heard a small detonation and the smell of smoke. I couldn't quite work out from her whether she was talking about just smoke from a fire... she had to leave in a hurry and the police were taking her away.
She seemed to give the impression that it may have been tear gas or something. It would be consistent with a tear gas grenade, a small bang, a flash and the smell of acrid smoke. That was what she seemed to be describing.
Update
Oval Tube station
A police officer said that he did not think there had been an explosion on the Northern Line at the Oval.
There had been a separate suggestion there may have been an explosion on the platform.
The atmosphere is calm, the police cordon has been moved back 200 metres from the station.
There are no ambulances, but lots of police vehicles.
Warren Street
have spoken to one person who was travelling on the northern line. He came off the northern line train and saw people coming, running away from the Victoria Line train, which is another line that serves this Tube station.
He said that there was a whole deluge of people sprinting towards him. He said everyone was very panicky and he said quite understandably that as soon as he saw those people he joined them and ran away from whatever had happened.
He did manage to talk to a couple of people. He said someone said something about smoke, someone else said something about a loud bang but he said he really didn't know whether those were things that had actually happened because he said there was so much confusion.
Shepherds Bush Tube stationp
Two police officers have said there was "an incident on the Tube", with "somebody threatening to blow himself up, but then running off".
Police are everywhere, and a helicopter is hovering above the Tube station.
Traffic is all around, the Tube station is closed and cars have been turned back. There are five or six stationary London buses.