PHILADELPHIA — Two gunmen fired more than 65 rounds on a Philadelphia street, sending nighttime pedestrians on a busy block teeming with markets and restaurants scrambling for cover and injuring six people, at least one of them critically, police said Friday.

Police responded around 11:30 p.m. Thursday in the Germantown neighborhood and found a 21-year-old woman shot multiple times in the abdomen and chest and lying near dozens of spent casings. Officers rushed her to the hospital, where she was in critical condition Friday.

Five men ages 19 to 29 were taken with gunshot wounds by private vehicles to two hospitals, police said. All were expected to survive.

Officers are looking at surveillance footage, Chief Inspector Scott Small told reporters late Thursday.

The injured woman, who suffered the most gunshot wounds, may have been the intended target, Small said. But the extensive crime scene — with a sea of casings on Germantown Avenue and bullets from at least two different-caliber semiautomatic weapons striking parked cars — made it difficult to be certain.

“The fact that we found over 65 spent shell casings — that’s a whole lot of shots fired — so it’s hard to even say who is the intended target and who is struck by stray gunfire,” Small said.