2nd Night of Unrest After Boy Is Slain : Violence: Rocks and bottles are thrown at officers in riot gear. Incident occurs after police shooting of 14-year-old Saturday night in Lincoln Heights.

For the second time in 24 hours, a violent, bottle-throwing standoff Sunday night pitted Los Angeles police against some Lincoln Heights residents, in the wake of the shooting death of a teen-ager by police who say he pointed a semiautomatic pistol at them.

Residents--mostly teen-agers and people in their 20s--hurled bottles and rocks, set trash dumpsters afire and shouted at police during the nearly three-hour melee. Some bought bottled drinks at stores, threw them at advancing officers, then scooped up the shards from the street to throw again.

“We thought we had it restored,” said Sgt. Albert Perez, who was trying to fend off the crowd. “I’ve been on the job for 18 years and I have never seen anything like this.”

Police citywide were put on tactical alert after more than 100 officers, some in riot gear, found themselves in a mile-long street battle less than 24 hours after 14-year-old Antonio Gutierrez was shot and killed by uniformed gang investigators answering a call about an armed man.

About 25 people were arrested Sunday, mostly for assault and disturbing the peace, said police Cmdr. Tim McBride. One officer was hit in the face with a rock.

Around 4 p.m. Sunday, police had hammered out the terms under which about 40 of Gutierrez’s friends and family could conduct a carwash to raise money for his funeral. But an hour later, police returned after bus drivers and residents complained that some youths were throwing rocks and blocking traffic.

McBride said the youths ran into a nearby house as officers arrived. After police entered the house, they handcuffed about 10 of the teen-agers and sat them on a curb. The growing crowd began to shout, setting fire to trash and throwing bottles.

SWAT members and officers from other divisions arrived. Some protesters were chased down and tackled. Officers marched in a riot line to break up the crowd, but protesters kept running into stores and buying bottles to throw.

Robert Estroda, 17, said he was in a liquor store with his girlfriend when police identified him as a bottle-thrower and marched him out. One of them, he said, hit him. He was not arrested.

Resident Sandra Beltran, 31, who was trying to get her children to safety, said, “All of a sudden this happened, but we got our point across.”

“Our point” was some residents’ anger over the shooting incident involving Gutierrez, which began Saturday about 9:40 p.m., when two officers answering a call spotted Gutierrez crossing the street carrying a pistol, Sgt. Rich Groller said.

When officers stopped to investigate, Gutierrez turned and pointed the gun at them, Groller said. Believing that the teen-ager was about to shoot, one officer fired six times, hitting Gutierrez in the chest. He was pronounced dead at the scene.

Police recovered a Tec-9 semiautomatic pistol, but relatives and friends who witnessed the shooting said Gutierrez was carrying a flashlight, not a gun. An 18-year-old who asked that his name not be printed said he had arranged for Gutierrez to carry the Tec-9 to another teen-ager. But he said that when Gutierrez saw police, he tossed the pistol away. “He didn’t even know how to use it,” he said. “Yet.”

Within an hour, nearly 100 officers were summoned to push back the throng Saturday, Groller said. Police arrested three men; no one was seriously injured.

On Sunday, friends of Gutierrez said the incidents were to show police that they felt the shooting was wrong.

“It was my friend that passed away,” said 18-year-old Albert Perez, no relation to the police sergeant. “It wasn’t right. We want justice”--the same phrase residents began chanting at police Saturday night.

“They murdered my son,” said the youth’s mother, Marianna Gutierrez, speaking through an interpreter.

According to some residents and the youth’s friends, Gutierrez had crossed the street to fetch a cigarette for a friend of his mother’s and was on his way back when police sped up the street with the headlights off. Without identifying himself, they said, the officer driving the car shot the youth several times. “They didn’t even say ‘Freeze,’ ” said family friend and witness Julie Noriega, 23. Gutierrez’s mother and other relatives said they were less than 20 feet away from where he was shot.

A police spokesman, Officer Don Cox, would not comment on any aspect of the shooting, which is under investigation.