It happened around 10:00 a.m. at Mama Giuliani's restaurant on County Line Road in Warminster Township.
Police say that former owner, Jose Delgado, fired four shots in the direction of the new owner. No one was hit.
Police say Delgado, of Philadelphia, left in a red Ford Explorer and may be headed to New York City.
The restaurant is closed and the surrounding shopping center was on lockdown.
Chopper 6 HD was overhead as a massive police presence remained on the scene.