PHILADELPHIA (CBS) — Philadelphia police are investigating a robbery early Monday morning at an SPCA office in the Juniata Park neighborhood.

The thief got away with a safe containing about $2,000 and an SPCA truck.

Police say a man in his 20s entered the office, in the 100 block of West Hunting Park Avenue, about 4 AM, claiming he had an injured dog.  He then pulled a knife, according to police, and demanded money.

Police say he put the safe in an SPCA animal rescue truck that was outside and fled.  The truck, a specialized 2000 red Chevy, is marked with “Pennsylvania SPCA” and phone numbers on it.

The SPCA says it is cooperating with the investigation and declined further comment.

Reported by Pat Loeb, KYW Newsradio 1060.