From the Times:
"Large parts of London were cordoned off after the bombs, including University College Hospital, near Warren Street, where armed police reportedly chased a man - thought to be a bomber - into the building."
"Soon afterwards, an internal memo was circulated among hospital staff asking them to be on the alert for a black or Asian man, 6ft 2ins in height, wearing a blue top with a hole in the back with wires protruding from it. "
"A press spokesman for the hospital confirmed that armed officers were inside. The incident is continuing."
In the news I don’t like the sound of the reference to “casualty numbers” (note plural) being low. So far only 1 injured has been confirmed.
Experts believed that the minor nature of the blasts could be a copycat attempt (3 trains and a bus?), in sympathy with the earlier group, or purely to cause panic. Obviously they have succeeded in the latter objective.