Piecing together concert bombing

Police search for more suspects and motive to Monday's deadly concert attack in Manchester, England.

(NBC News) – The suicide bomber who killed 22 people after an Ariana Grande concert was part of a network and not a lone-wolf attacker, police said Wednesday as troops were deployed near landmarks and three more suspects were arrested.

“It is very clear this is a network we are investigating,” Manchester police chief Ian Hopkins said. “We are carrying out extensive searches.”

Earlier, interior minister Amber Rudd told the BBC that suspected bomber Salman Abedi “was known” to intelligence services. She added that up to 3,800 soldiers would be put on Britain’s streets.

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