PINELLAS PARK, Fla. -

Police arrested two teens for their connection in the attack of an 83-year-old man and the theft of his car.

Pinellas County Sheriff's Office say Charles Clark was attacked in the parking lot of his apartment complex Tuesday.  According to authorities, Clark was beaten and stabbed in the arm. 

Police say his car was also stolen. 

Authorities say three teens are involved in the case.  A 13-year-old boy turned himself in and a 16-year-old boy was arrested on Wednesday.

Police are still looking for a 15-year-old girl. 

Police say the teens took the keys of Clark's car.  Deputies say they stole the car later upon returning. 

Deputies say the 13-year-old told authorities he didn't beat Clark, but admitted to stealing the car. 

Police have charged the 13-year-old with grand theft of a motor vehicle.