Two men were hospitalized, one in critical condition, after they were shot inside a house in Kingsessing late Sunday night, cops said.

It's unclear what sparked the gunfire, which broke out at 9:54 p.m. in a house on Malcolm Street near Frazier. Police said a 20-year-old man was hit once in the abdomen and once in the right thigh and a 65-year-old man was hit once in the right leg.

Both were taken to the Hospital of the University of Pennsylvania by medics, where the 20-year-old was listed in critical condition and the older man was stable.

Police said no arrest had been made as of 10:30 p.m. Sunday, and cops were at the scene investigating.