LOS ANGELES -- At least five people are dead after a four-hour span of violence in Los Angeles County.

The string of killings began around 10:25 p.m. Saturday when a man in his 20s was stabbed to death outside a supermarket in Hawaiian Gardens, authorities said.

The victim was attacked in the parking lot of a Food 4 Less in the 12200 block of Carson Street.  He was pronounced dead at a local hospital.

No arrests have been reported.

Nearly 20 minutes later, two men were shot to death in Pico Rivera.  The shooting took place in the 3900 block of Aleman Avenue around 10:44 p.m. Saturday.  One man was pronounced dead at the scene while the other was pronounced dead at a local hospital, officials said.

Another shooting in Whittier later claimed the life of a man, who was said to be 20-years-old.  The man was shot around 12:21 a.m. Sunday in the 10900 block of Carmenita Road, officials said.

The latest killing took place in the unincorporated Athens area around 2:40 a.m., according to Deputy Art Spencer of the Sheriff's Headquarters Bureau.

A man, whose name was withheld, was shot to death in the 1300 block of West 94th Street, Spencer said.

He died at a local hospital.

Few details have been released in all of the homicides.