LANDISVILLE – A State Police Fire Marshal is investigating the cause of a three alarm fire this morning in Lancaster County. Units responded around 4 a.m. to a building on the 300 block of East Main Street in East Hempfield Township. The building housed the Black Knight Tavern & Grill along with several apartments. Five people were able to flee their residences safely. The Red Cross is assisting those who were displaced. One firefighter was taken to the hospital for treatment of an injury.