OAKLAND — A sniper who opened fire Sunday night from a building on police officers who had made a car stop on suspected drug dealers was still being sought Monday.

Even though the officers heard "bullets whizzing by them," no one was hurt and no police cars were damaged, Officer Jeff Thomason said Monday.

The shooting happened about 11:27 p.m. Sunday in the Acorn apartment complex in the 1000 block of 8th Street near Adeline Street.

Officers had made a car stop in which they found a large amount of rock cocaine and were detaining three people inside the vehicle when someone began shooting at them from a nearby high rise.

Police did not return the fire. Officers from throughout the city rushed to the scene and several blocks were shut down while police searched the building but could not find the gunman.

Thomason said investigators were trying to determine if there was a link between the people stopped and the sniper attack. Thomason said it was "a very scary situation" but that it would not "stop our efforts" to enforce laws.

It was the third time in two days East Bay law enforcement officers came under violent attack.

Around midnight Sunday a man engaged in a lengthy gunfight with CHP officers on Interstate 580 near Harrison Street after he was stopped for traffic violations. He gave up after being wounded several times. Two CHP officers suffered minor injuries in the confrontation.

And on Saturday morning five Oakland and BART police officers shot and killed a man who charged at them while holding two knives in the 1500 block of 33rd Avenue. The man had a history of mental problems and was heard by witnesses telling the officers "Shoot me, shoot me." No officers were hurt.