Wesley Kimmick, 17, of Latrobe, remains hospitalized at UPMC Presbyterian in Pittsburgh after the explosion Saturday afternoon at his grandmother's home.

"There was a quarter stick of dynamite in the house where he was staying, and he got a hold of it and it blew him up basically," said his mother, Heather Adams.

Authorities said they're not sure what exploded and are investigating.

The blast occurred in Latrobe along Lloyd Avenue around 2:30 p.m. Saturday, police said. Kimmick's uncle, Tony Adams, said Kimmick was in the bedroom when he removed the object from his backpack and it exploded unexpectedly.

Edward Adams, father of the victim, said, "If you ask him questions he'll nod his head 'yes' or 'no' because he has a tube in his mouth right now. I don't think he's aware of what happened yet."

Adams, who said he's going to find out where Wesley got the dynamite from, said investigators questioned him Monday about what he knows about the explosive device.

Wesley is a student at Derry High School and had plans to enlist the army.