A number of Tube stations have been evacuated and lines closed after minor blasts in what Met Police chief Sir Ian Blair says is a "serious incident".
Sir Ian said only three Tube lines were still suspended and it was time London started to return to normal.
The minor explosions - just two weeks after blasts killed 56 - involved detonators only, a BBC reporter said.
In addition, a blast was reported on the top deck of a Number 26 bus in Hackney Road in Bethnal Green.
There were no injuries and the bus suffered no structural damage.
Eyewitnesses heard bangs and saw abandoned rucksacks at the sites of the incidents at Warren Street, Shepherd's Bush Hammersmith and City line and Oval tube stations as well as the number 26 bus.
At Warren Street and Oval a man was seen running away from the scene.
Large areas around all four sites were cordoned off.
Casualties 'low'
One person was injured at Warren Street. There were reports the injured person may have been holding a rucksack containing the detonator.
Sir Ian told reporters: "The bombs appear to be smaller than on the last occasion but we don't know the implications of all this yet."
Police in protective clothing were deployed at the bus site
He appealed for witnesses with mobile phone pictures of any of the incidents to send them to www.police.uk.
The BBC's Andrew Winstanley said devices had been found but appeared to have been dummies, containing no explosives.
Police said armed officers had been deployed to University College Hospital after an incident. A large area was cordoned off.
There were reports a memo had been circulated to staff to look out for a 6ft 2in black or Asian man with wires sticking out of his top.
The hospital has not received any casualties or been alerted to casualties.
A man was arrested near Downing Street by armed police and led away down Whitehall.
The whole of the Northern Line has been suspended, along with the Victoria Line, the Hammersmith and City line, Piccadilly and the Bakerloo line.
Police have set up cordons round the stations
A number of other stations were closed including Great Portland Street, Westminster, Waterloo, St Paul's and Oxford Circus tube stations, as well as Waterloo tube station and King's Cross Thameslink.
Tony Blair cancelled events in the afternoon and attended a meeting of the Cobra committee along with Sir Ian. Whitehall was briefly closed down.
London Underground went to an amber alert with trains taken to the next station and evacuated.
An eyewitness at Oval station said there had been a small bang, and a man had then run off when the Tube reached the station.
A spokesman for Stagecoach said the driver of the number 26 bus travelling through Shoreditch had heard a bang on upper deck, gone upstairs and seen the windows were blown out.
The bus driver was very shaken but said to be fine.
At Shepherd's Bush Hammersmith and City line station, police told reporters that a man had threatened to blow himself up and then ran off.
Sosiane Mohellavi, 35, was travelling from Oxford Circus to Walthamstow when she was evacuated from a train at Warren Street.
"I was in the carriage and we smelt smoke - it was like something was burning. "Everyone was panicked and people were screaming. We had to pull the alarm. I am still shaking."
The BBC's Rory Barnett said there had been no smoke on the platform at Warren Street.
from bbc:
http://news.bbc.co.uk/1/hi/uk/4703777.stm
Sir Ian said only three Tube lines were still suspended and it was time London started to return to normal.
The minor explosions - just two weeks after blasts killed 56 - involved detonators only, a BBC reporter said.
In addition, a blast was reported on the top deck of a Number 26 bus in Hackney Road in Bethnal Green.
There were no injuries and the bus suffered no structural damage.
Eyewitnesses heard bangs and saw abandoned rucksacks at the sites of the incidents at Warren Street, Shepherd's Bush Hammersmith and City line and Oval tube stations as well as the number 26 bus.
At Warren Street and Oval a man was seen running away from the scene.
Large areas around all four sites were cordoned off.
Casualties 'low'
One person was injured at Warren Street. There were reports the injured person may have been holding a rucksack containing the detonator.
Sir Ian told reporters: "The bombs appear to be smaller than on the last occasion but we don't know the implications of all this yet."
Police in protective clothing were deployed at the bus site
He appealed for witnesses with mobile phone pictures of any of the incidents to send them to www.police.uk.
The BBC's Andrew Winstanley said devices had been found but appeared to have been dummies, containing no explosives.
Police said armed officers had been deployed to University College Hospital after an incident. A large area was cordoned off.
There were reports a memo had been circulated to staff to look out for a 6ft 2in black or Asian man with wires sticking out of his top.
The hospital has not received any casualties or been alerted to casualties.
A man was arrested near Downing Street by armed police and led away down Whitehall.
The whole of the Northern Line has been suspended, along with the Victoria Line, the Hammersmith and City line, Piccadilly and the Bakerloo line.
Police have set up cordons round the stations
A number of other stations were closed including Great Portland Street, Westminster, Waterloo, St Paul's and Oxford Circus tube stations, as well as Waterloo tube station and King's Cross Thameslink.
Tony Blair cancelled events in the afternoon and attended a meeting of the Cobra committee along with Sir Ian. Whitehall was briefly closed down.
London Underground went to an amber alert with trains taken to the next station and evacuated.
An eyewitness at Oval station said there had been a small bang, and a man had then run off when the Tube reached the station.
A spokesman for Stagecoach said the driver of the number 26 bus travelling through Shoreditch had heard a bang on upper deck, gone upstairs and seen the windows were blown out.
The bus driver was very shaken but said to be fine.
At Shepherd's Bush Hammersmith and City line station, police told reporters that a man had threatened to blow himself up and then ran off.
Sosiane Mohellavi, 35, was travelling from Oxford Circus to Walthamstow when she was evacuated from a train at Warren Street.
"I was in the carriage and we smelt smoke - it was like something was burning. "Everyone was panicked and people were screaming. We had to pull the alarm. I am still shaking."
The BBC's Rory Barnett said there had been no smoke on the platform at Warren Street.
from bbc:
http://news.bbc.co.uk/1/hi/uk/4703777.stm
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