Two small planes collided midair and crashed into the ocean off San Pedro on Friday, officials said.
The U.S. Coast Guard and crews from various fire and police agencies converged on the spot off the San Pedro coast, near the Los Angeles Harbor, to search for any possible survivors and the plane wreckage, said Lt. Jonathan McCormick, of the U.S. Coast Guard.
A fisherman on a boat saw one of the planes crash into the water and called 911, officials said.
Dive teams planned to search the waters through the night.
The Coast Guard, meanwhile, closed the Los Angeles Harbor enterance to all vessel traffic while crews searched the debris field and the National Transportation Safety Board planned to investigate the crash.
A major winter storm brought blizzard conditions to part of the Plains and Midwest this week while severe storms brought damaging tornadoes to the South.
As the Denver Broncos and Carolina Panthers clash for the Super Bowl 50 title in Santa Clara, California, on Sunday, they will do so in one of the most energy-efficient stadiums in the world.
Punxsutawney Phil failed to see his shadow on Feb. 2, 2016, predicting an early start to spring for the United States.
There have been 11 avalanche deaths across the United States this month, the largest number of fatalities in January since 1998.
Above-normal temperatures covered the region ahead of Friday's avalanche, AccuWeather Senior Meteorologist Matt Rinde said.