Police are looking for four men in two separate shootings in the city that left a teenager and a 31-year-old man critically wounded Sunday night.

In the latest shooting, a 15-year-old boy was shot in the left side of the back about 9 p.m. when he ran away from two men who demanded his iPod on the 1800 block of West 67th Street in West Oak Lane, police said.

The youth, who was walking to a Chinese take out on Ogontz Avenue when he was wounded, was rushed to Albert Einstein Medical Center, where he was reported in critical condition.

About an hour earlier, a man was sitting on the stoop of his home on the 2200 block of Ingersoll Street in North Philadelphia when two men approached and, without saying anything, started shooting at him, police said.

Even when the man ran into the house, one of the gunmen pursued and kept firing, police said.

The victim, who was wounded seven times in the head, face and body, was taken in a private vehicle to St. Joseph's Hospital, which transferred him by ambulance to Temple University Hospital.

Police said he is in critical but stable condition.