PHOENIX -- An employee of a pawn shop shot and critically wounded one of two gunmen who had pointed a gun at a worker during a robbery attempt Sunday morning, Phoenix police said.

At about 11 a.m., two armed Hispanic men wearing masks entered Casa De Empeno Pawn Shop at 4126 W. Indian School Road. One of the gunmen pointed his weapon at the neck of a 15-year-old worker seated by the door, said Sgt. Andy Hill of the Phoenix Police Department.

The store manager stepped out and fired several shots at the robbers, Hill said. A bullet struck one of the robbers in the head and the other fled.

The robber who got away stole a vehicle from a customer, Hill said. That vehicle is a 1996 custom green Suburban with an Arizona license plate reading AFC5540.

Two other people in the store -- a second worker and a customer -- were not wounded, Hill said.

"There may have been more suspects," Hill said. "I just don't know at this point."

The 21-year-old robber remained in critical condition late Sunday afternoon, Hill said.