MILWAUKEE (CBS 58) -- A man has been taken into custody in connection to an "unprovoked" knife attack at Pulaski Park Wednesday afternoon, April 22. 

The Milwaukee County Sheriff's Office responded to a report of a stabbing at Pulaski Park around 6 p.m. Deputies arrived and found that Milwaukee Police Department officers detained a 21-year-old man. 

The 21-year-old was running from the park and appeared to have suffered from a fresh stab wound to the leg and a skull injury. 

Officers treated the 21-year-old and found a knife and a makeshift tinfoil explosive on him. He was taken in custody and transported to an area hospital. 

An investigation revealed that a 13-year-old boy and a 19-year-old man had suffered from stab wounds. The victims say the 21-year-old, unprovoked, approached and stabbed the 13-year-old who was sitting at a bench next to the basketball court.

The 19-year-old and another unidentified person came to the aid of the 13-year-old. The unidentified person produced a knife and stabbed the 21-year-old in the leg during the scuffle. 

Another knife and tinfoil explosive were found at the scene. 

Investigators say the 21-year-old claims he was robbed at knifepoint earlier that night by three individuals, who punched him and stole his sweatshirt. 

The 21-year-old has pending charges of recklessly endangering safety.