Philadelphia law enforcement officials are investigating two bodies found in the Schuylkill River Wednesday morning.

Chief Inspector Scott Small said the remains were found in the river in Fairmount Park just before 4 a.m. Wednesday.

"Both of the dead bodies had duct tape wrapped around their face. They also both appeared to be bound, their wrists and ankles. They also appeared to be tied or tethered to some piece of debris, some sort of weight used as an anchor to take them under water," he said, according the Associated Press.

The deceased have not yet been identified.

"We're not even certain if they're males," Small said.

Police found a 20-year-old half-naked man who said he and two others had been abducted and thrown in the river.

Officers responded to a call to the 2300 block of Kelly Drive about a man shouting, Small said. The survivor told the police that he and two others were kidnapped in Philadelphia by a group of men who forced them into the back of a van. 

Later, the suspects tied their wrists and ankles, duct taped their mouths and robbed them. The survivor was stabbed nine times in the torso and legs, and then thrown into the river off Kelly Drive. He managed to escape, but the other two died. 

It remains unclear whether the victims and the assailants had any connection. Police officers sent to the scene of the crime scanned for footprints, tire tracks or any other evidence, reports Philly.