Lightning strikes in Los Angeles County killed a 20-year-old man in Venice Beach Sunday and injured nine other people, one critically, authorities said.

Eight people -- seven adults and a 15-year-old said in broadcast reports to be a boy -- were hospitalized after lightning struck Venice Beach about 2:20 p.m., according to Katherine Main of the Los Angeles Fire Department.

Another person was struck earlier on Catalina Island, according to the sheriff's department.

 Lt. Larry Dietz of the county coroner's office said a 20-year-old man was pronounced dead at a hospital after being taken there from Venice Beach.

He was unable to confirm that the deceased victim was a swimmer who, according to the fire department, was in grave condition when pulled from the water and taken to a hospital with CPR in progress.

Six people, including the teen, were transported in fair condition and were expected to fully recover, fire officials said.

All victims were believed to be accounted for, Main said.

City fire paramedics set up a triage and treatment center on the crowded beach near Washington Boulevard.

Thirteen people were treated, including those who were hospitalized, according to reports from the scene.

Also hit by lightning from the same storm, but 90 minutes earlier, was a 57-year-old man struck on a golf course at Avalon, on Santa Catalina Island.

Minor flooding hit Avalon, and at least two brush fires broke out as a thunderstorm hit there at midday Sunday.

``At 12:55 p.m., Doppler radar indicated a line of thunderstorms between the Palos Verdes Peninsula and Catalina, producing locally-heavy rainfall,'' the National Weather Service said. ``This line of storms was drifting to the northwest at around 10 miles per hour.''

The small number of Los Angeles County firefighters and deputies on the island were scrambling with several simultaneous emergencies at and near Avalon, according to Sgt. Robert Berardi.

The Avalon lightning strike victim was preliminarily identified as a 57-year-old man, who was struck on a golf course. He was in stable condition a deputy at the sheriff's Avalon Station said.

Two brushfires from lightning strikes were confirmed in the bone-dry back country, ``and a couple more were popping up'' as the storm moved northwest across the island, Berardi said. They were all put out quickly.

Lightning also struck and damaged the exterior  house and a car in Redondo Beach, where power outages were reported, according to media accounts.

The thunderstorm had earlier drenched the San Diego coast, and struck Santa Catalina Island at 12:45 p.m. today.

The National Weather Service issued a special marine weather advisory, warning of thunder, lightning, hail and possibly sudden choppy waves.

Thunderstorms are unusual along the coast, NWS officials have said, because the ocean tends to cool the thermal dynamics required for such storms.