Seven people were killed Sunday in south Texas and several others injured when a car plowed through a group waiting at a bus stop outside a migrant aid center, police said. US media later reported that one person had died from their injuries at a local hospital.

Law enforcement said they were treating the incident as an accident for now, though a witness told AFP the driver had yelled insults at the group before accelerating.

The gray sport utility vehicle "went through a red light and ran over several people" at around 8:30 am (1330 GMT) in Brownsville, a border city at the southernmost tip of the state, local police spokesman Martin Sandoval told AFP.

He said seven people died and "nearly 10" other people were injured.

Witness Luis Herrera, whose arm was hurt in the incident, told AFP the crash was "sudden."

"A woman went by in a car and warned us to get out of the way," he said.

Herrera then described the driver as accelerating the car to full force.

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