from boston.com:
LONDON --Three London Underground stations were evacuated at midday Thursday following reports of incidents, British Transport Police said. The Fire Brigade was investigating a report of smoke at one station.
Emergency services also were responding to a report of an incident on a bus in east London, police said.
A London Underground spokesman said there were no reports of casualties in the unspecified incidents.
ETA:
confirmed small blasts at several stations, one person injured.