President Obama says he's shocked and saddened after 14 people were killed and 50 injured in a shooting at a cinema in Colorado.

Witnesses say a gunman wearing body armour and a gas mask opened fire during a midnight screening of the new Batman film in Denver, after setting off a smoke bomb.

Local police say there was only one suspect, despite earlier reports that there might have been two - and he's been arrested.

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Police are now searching the suspect's apartment for explosives.