LOS ANGELES — Seventy-six people were arrested and more than 30 buildings and business were damaged when a downtown celebration turned chaotic after the Los Angeles Lakers won their 17th National Basketball Association championship, police said Monday.

Causes for the arrests included failure to disperse, vandalism and assault on a police officer, a police department statement said.

Eight officers were treated for injuries and two members of the crowd were taken to hospitals after being injured by so-called less lethal munitions fired by officers, the statement said.

The celebration by about 1,000 people was initially largely peaceful but “unruly individuals” mixed into the crowd and threw glass, bottles, rocks and other projectiles at officers, police said in the statement.

The Lakers beat the Miami Heat 106-93 Sunday night in Lake Buena Vista, Florida, to win the NBA Finals in six games.

The sounds of fireworks immediately reverberated across Los Angeles and fans headed to Staples Center, the Lakers’ home court, to celebrate — despite admonitions to stay away.

Celebrations were mostly peaceful but some rocks and bottles were thrown at officers, KABC-TV reported. Videos posted online also showed cars doing “donuts” and fireworks being set off in the street — which is illegal without a permit, KCAL-TV reported. Witnesses told the Los Angeles Times that officers fired “beanbag rounds” at one point, which sent some people running.

A few officers on horseback worked to push the crowd away from Staples Center. Later in the night, the large gathering fractured into several groups.

Los Angeles Mayor Eric Garcetti had discouraged public gatherings to celebrate the win, instead urging fans to cheer on the team from home.

“As we cheer our @Lakers’ 17th championship, please remember it’s still not safe to gather in groups,” the mayor tweeted, in reference to the coronavirus pandemic.