The Immigration Minister Damian Green has blamed the rain for the length of queues at Heathrow airport, saying: "This was caused mainly by the severe weather leading to flight diversions and changing flight schedules and the bunching of arrivals."
The lengthy queues have been criticised by the shadow immigration minister Chris Bryant, London Mayor Boris Johnson and airlines.
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MI5 has reportedly launched two urgent inquiries into how it missed the danger posed by the Manchester bomber, Salman Abedi.
Helicopters are searching for survivors who may be marooned after a weekend of heavy rain.
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