The BBC is providing a running account of events related to the London blasts.
The last five entries:
The last five entries:
1758: Ken Livingstone, the mayor of London, says space limitations and the number of people using the Underground make airport-style security checks difficult.
1755: Metropolitan Police Commissioner Sir Ian Blair says the arrest of a man outside 10 Downing Street appears "entirely unconnected" to the transport system incidents.
1750: Sir Ian says London is "back to business". He says it will take "a little bit longer" to determine whether there is a connection between the incidents on Thursday and those of 7 July - but adds that the intention on Thursday "must have been to kill".
1630: Armed police return to University College Hospital to search the premises.
1620: Two people are detained, police say. A police source says officers are looking for an unknown number of fugitives.
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