A military spokesman has said three people are now dead following a shooting and subsequent stand-off at Marine Corps Base Quantico in Virginia. He said the suspect in understood to have died from a "self-inflicted wound".
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The prime minister said the public should remain vigilant following a meeting of the Government's emergency committee Cobra.
The Queen has arrived at Royal Manchester Children's Hospital to meet victims of the suicide bombing at the city's arena.
Greater Manchester Police have deemed a suspicious package safe after bomb disposal units were dispatched to a road in Hulme.