Two pedestrians were killed in separate hit-and-run accidents in Philadelphia early Sunday morning, police said.

In the first accident, a man was found unresponsive around 12:10 a.m. on the 3500 block of North Randolph Street in North Philadelphia. He was pronounced dead at 12:20 a.m., having suffered injuries consistent with being struck by a vehicle, police said. No information about the driver was available.

Then, an unidentified 17-year-old youth was crossing midblock in the inner lanes of the 7600 block of Roosevelt Boulevard in Rhawnhurst shortly before 1 a.m. when he was struck by a 2007 or 2008 Chevrolet Impala or Malibu, police said. The driver fled southbound with damage to the driver-side headlight and windshield. The side mirror was knocked off.

The teen sustained massive head trauma and other injuries and was taken to Jefferson Torresdale Hospital, where he was pronounced dead at 3:20 a.m. Police are asking anyone with information about the vehicle or driver to contact the Accident Investigation Division at 215-685-3180 or call 911.

As the Inquirer and Daily News reported in early September, 11 people have died this year in as many crashes on Roosevelt Boulevard, and another died on the Roosevelt Expressway limited-access highway. Last month, a man was run over and killed on the 7200 block of Roosevelt Boulevard, on the border of the city's Castor Gardens and Mayfair sections.

Lawmakers plan to begin using speed cameras in an effort to reduce the number of accidents on the notoriously dangerous boulevard.

Sunday's accidents followed two other hit-and-run crashes since Friday, when a 50-year-old man was killed in Tacony after being struck by both a gray Ford Fusion and a dark-colored Mitsubishi. Both drivers fled.

Saturday afternoon, a 59-year-old man was critically injured when he was hit by a white pickup truck while attempting to cross Market Street at 21st. That driver also left without stopping.