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.

There are unconfirmed reports one victim was a three month old baby.

A 24 year old man's been arrested and is in custody - and local police chief Dan Oates says they're now searching the suspect's apartment - and a vehicle in the cinema's carpark: