A Houston police officer has fatally shot an unarmed man suspected of damaging a traffic sign and charging toward the officer three times.

Police spokesman John Cannon said Sunday that investigators believe the man was on drugs.

The officer was on patrol Saturday afternoon when he saw an agitated man damage a street sign, pace and yell obscenities.

Cannon says the officer, identified as K. Levi, tried to calm the man but the suspect charged at him twice. Levi used a Taser on the man twice, but it was unsuccessful.

When the man came at him a third time, Levi fatally shot him. The man's name wasn't immediately released.

Levi was put on administrative duty. The suspect and officer are both black.