Philadelphia police are increasing security after a disturbing find outside a mosque.

FOX's Gurnal Scott reports:

Philadelphia police say they don't yet know who left a severed pig's head near the Al Aqsa Islamic Society building.

Commissioner Charles Ramsey says investigators are going over surveillance video that shows someone tossing the animal head out of a pick-up truck. So far no suspects have been identified.

The action -- which has been seen in other countries -- is considered a means of taunting and showing anti-Muslim sentiment. Tenets of Islam do not allow Muslims to eat pork.

The city is offering a $2,000 reward for information that could help in prosecuting hate crimes.

Gurnal Scott, FOX News.