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ESCONDIDO, Calif. — Four pedestrians, including two children, were killed by a vehicle Tuesday night in Escondido, authorities said.

Just before 8:30 p.m., a 28-year-old Escondido woman was driving on San Pasqual Valley Road near Oak Hill Drive when her car hit a man, a woman and two boys, Escondido police Lt. Scott Walters said.

The 33-year-old man and an 11-year-old boy were pronounced dead at the scene, Walters said. A 50-year-old woman and a 10-year-old boy were taken to Palomar Medical Center, where they later died.

The victims’ names were withheld pending family notification.

The two boys were brothers and the woman was the boys’ grandmother, the lieutenant said. The man was believed to have been dating the children’s mother.

The Mazda driver was taken to Scripps Memorial Hospital for treatment of moderate injuries, Walters said. Intoxication was not believed to have been a factor in the crash, according to police.

Officers were still investigating how fast the woman was driving and where the pedestrians were in the road when they were struck.

Anyone with information about the crash is asked to call EPD Traffic Division Officer Mike Nelson at 760-839-4407.