At least four killed in California plane crash

Four people died and up to five more were missing after a small plane crashed into two houses in a residential neighborhood in southern California, authorities said late Monday.

The Cessna 310 aircraft crashed "under unknown circumstances" about a half-mile northeast of Riverside Municipal Airport, just east of Los Angeles, Federal Aviation Administration spokesman Ian Gregor told AFP.

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The crash was reported at approximately 4:40 pm local time.

The city's fire chief Michael Moore told journalists that five people were on the plane, which split apart when it hit two homes that authorities believe both had occupants inside.

Authorities are actively searching for up to five people. Moore said it is unclear whether the four killed were aboard the plane or on the ground.