Maine shooting: Witness describes moment he saw gunman holding weapon in bowling alley

A witness has described a harrowing scene at the bowling alley in Lewiston, Maine, with shots ringing out while he was putting on his shoes.

The gunman opened fire at a bowling alley and a bar and "hundreds" of police are now trying to find him with the city of Lewiston in lockdown.

Up to 20 people have been killed.

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