An Old Glory-hating arsonist ignited a flag hanging on an exterior gate of a Manhattan storefront in an incident captured on surveillance video, police said.

The suspect, riding a white bicycle, pedaled up to the security gate on the outside of the store on Seventh Avenue near West 14th Street in the West Village at about 9:40 p.m. Friday, cops said.

He then pulled out a lighter and held a flame up to the American flag that was hanging on the gate, authorities said.

The bottom half of the flag ignited before the suspect pedaled away from the scene, cops said.

The suspect, who is still at large, was last seen riding his white bicycle and wearing a maroon shirt, black pants and white sneakers.