Again: four more bombs hit London transit

London Metropolitan Police commissioner Ian Blair has confirmed that there have been three small explosions on tube trains at Warren Street, Oval and Shepherd's Bush stations, and another small explosion on a No. 26 bus in Hackney.

The London Ambulance Service has not found any injured people, but one person has reported themselves to a local hospital. It is not yet known if this is connected with the blasts.

All the devices were "conventional" but possibly faulty, and contained no chemical or biological agents. Not all the bombs exploded fully, Bomb Squad officers are working on making them safe. There are no reports of the deaths of suspects who attempted to set the explosives off.

Incidents

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 is said to be fine.

One injury sustained at Warren Street tube station has been confirmed by authorities. There have been no other reports of injuries, and authorities are reporting no casualties.

At around 15:25, a man was arrested by armed police in Whitehall, which is cordoned off. A second man was arrested in the Whitehall area around 16:15, but Police have confirmed that this arrest is unconnected with the explosions.

Armed police were deployed at UCL Hospital, near Warren Street tube station, after reports of a suspect entering the hospital. There was speculation that one of the bombers may have been injured and sought treatment at the hospital. A Scotland Yard spokesman had said "We are dealing with an incident at University College Hospital and we have armed officers deployed there. We cannot go in any further detail at this stage." A UCL spokeswoman confirmed that an email had been sent to staff asking them to be on the lookout for the suspect. At 16:00 a spokesman for the Metropolitan police confirmed that the incident was over, but armed police returned to the hospital 30 minutes later to search the premises. Police have now also confirmed this is unrelated to the explosions.