NEW YORK - Dozens of strangers converged from all directions to lift a 5-ton bus off the body of a pregnant woman - a superhuman effort that managed to save the life of her child but was too late for her.

Seven months pregnant, Donnette Sanz was crossing one of the busiest intersections in the Bronx on her lunch break Thursday when she was struck by a van whose brakes failed. The impact sent the 33-year-old NYPD traffic agent flying into the path of a yellow school bus and pinned her underneath.

About 30 people helped lift the bus, and Sanz was rushed to a hospital, where doctors delivered her boy by Caesarean section. The 3-pound, 6-ounce infant, named Sean Michael, was in critical condition Friday but showing signs of improvement.

Mourners and neighborhood residents gathered outside the hospital Friday to pray for Sanz and her child.

The 72-year-old van driver, Walter Walker, pleaded not guilty Friday to criminally negligent homicide and aggravated unlicensed operation of a motor vehicle. He was being held on $100,000 bail, and his attorney didn't immediately return a phone call.