Gunfire in northeast San Antonio sent two men to the hospital Monday night.

Investigators say a man fired multiple shots into the back of a house in the 6300 block of Aspen Farm just after 7 p.m. 

A man in his 20s was shot in the back and critically wounded. The other victim, a man in his 50s, was shot in the arm.

Both victims were taken to San Antonio Military Medical Center for treatment.

Witnesses tell police they saw the shooter leave the scene on foot. No arrests had been made as of 10 p.m. Monday.

Police continue to investigate what might have led to the shooting.