A Long Beach man was arrested Monday morning on suspicion of fatally stabbing someone during a fight in Belmont Shore Sunday night, and additional suspects are still being sought, police said today.

Sergio Alvarez, 26, was arrested on suspicion of murder just after 8 a.m. Monday in the area of 10th Street and Gardenia Avenue after detectives “worked through the night” to identify a suspect in the deadly stabbing of 33-year-old Gavin Clason, police said in a press release Thursday.

Police say Alvarez and another man were fighting with Clason around 8:46 p.m. Sunday in the parking lot of a fast-food restaurant in the 3900 block of East Ocean Boulevard. The conflict escalated to Clason being battered and stabbed multiple times in the chest before his attackers fled on foot, authorities said.

First responders arrived shortly after and rendered aid to Clason before he was pronounced dead at the scene, police said.

Following his arrest, Alvarez was charged Wednesday with one count each of murder and robbery, court records show. He hasn’t yet entered a plea. His arraignment is scheduled for March 30. In the meantime, Alvarez is being held on $2 million bail, records show.

The investigation is still ongoing, with police looking for possible additional suspects and trying to determine the motive behind the stabbing, the LBPD said.

Anyone with information regarding the incident is urged to contact detectives at 562-570-7244.

Man stabbed to death in fight along Ocean Boulevard, LBPD says