LONDON (Reuters) - Up to four explosions hit London's transport system on Thursday, exactly two weeks after more than 50 people were killed in blasts on underground railway trains and a bus.
No one was reported injured in the blasts that caused major disruption and shook the nerves of an already jittery city.
Witnesses said they had seen what could have been a would-be bomber running away after dropping a rucksack on one of the trains.
"We all got off on the platform and the guy just ran and started running up the escalator," one witness who gave her name as Andrea told the BBC.
"Everyone was screaming for someone to stop him. He ran past me ... and he ran out of the station. In fact he left a bag on the train," she said.
A blast blew out the windows of a bus in Hackney in east London, but there were no reported injuries.
Sky News is reporting it apears as these explosions where smaller than the ones used in the attacks two weeks ago. This seems strange to me. Could it be the explosions contained chemicals? Why would they set of smaller bombs with little impact?
Passengers reported one blast at Warren Street station off Tottenham Court Road in central London.
There has also been an incident on a bus in Hackney, East London.
Stations at Warren Street, Oval and Shepherd's Bush have been closed.
Also, more details on Number 26 bus from Sky News.
Bus operator Stagecoach said: "The driver heard a bang he believed came from the upper desk of the bus.
"The windows were blown out. There are no reports of any injuries."
The No 26 bus was travelling from Waterloo to Hackney in the east of city.
The BBC news has additional information on armed officer deployment and police response to the situation.
London, you are in our prayers.