A Marine on leave was among two men critically wounded early Friday in separate shootings just blocks and less than two hours apart in North Philadelphia, police said.

Lance Cpl. Nicholas Green, 20, who is from Media, was shot in the stomach about 1:40 a.m. during a robbery at 21st and West Norris Streets.

Green, a combat illustrator assigned to the Cherry Point, N.C, Marine Corps Air Station, had attended a party in the neighborhood, officials said.

Police said he apparently was shot when he resisted a gunman's demand for his money,

Green was taken to Temple University Hospital and he remained in critical condition Friday night. Police are seeking the shooter.

Green's mother, Christine Kidd, issued a statement through Temple University Hospital that said, in part, "I would like to extend my sincerest appreciation and thanks to his doctors and nurses; to the Marine Corps, which has provided immediate support; and to the entire Philadelphia community - whose thoughts and prayers mean so much to Nicholas and his family, as well as his many, many friends."

At 12:03 a.m. Friday, a 23-year-old man was shot in the chest with a shotgun on the 2000 block of North Judson Street, near West Norris Street, police said.

He also was taken to Temple University Hospital, where he was reported in critical condition.

No word yet on possible motives in this shooting.

Judson Street runs parallel to 23rd and 24th Streets.