title: UK's May 'receiving regular updates' on London tube station incident: PM's office
text: LONDON (Reuters) - British Prime Minister Theresa May is being regularly briefed after armed police rushed to an incident at a London underground station on Friday, with local media reporting there had been an explosion on a packed rush-hour commuter train.  The prime minister is receiving regular updates,  a spokesman from May s office said when asked if May was aware of the incident. 