PHILADELPHIA, Pa. -

Authorities say police officers came under fire in Philadelphia for the second night in a row, but didn't return fire and arrested two suspects.

Police said that at about midnight Saturday, officers noticed two men apparently smoking marijuana on South Street, an area packed with restaurants, shops and clubs.

They pursued the men to a nearby street, where authorities said one of the men opened fire, discharging four shots. The officers didn't return fire and arrested two suspects, recovering a gun.

Several people were injured in unrelated shootings overnight.

The confrontation came a day after an officer was ambushed in her car in west Philadelphia and a university police officer and four other people were shot before the suspect was killed. One of the people shot later died.