Police : Boy , 12 , had pointed weapon in Cleveland park , but it turned out to be air gun . Officers went to park after getting 911 call . Comment: Police : Officer told boy three times to show hands before the shooting .
Police : Boy , 12 , had pointed weapon in Cleveland park , but it turned out to be air gun . Officers went to park after getting 911 call . Video shows boy was shot 2 seconds after police car pulled up . Police : Officer told boy three times to show hands before the shooting .