LOS ANGELES — A pregnant woman was killed and two others injured after a brawl broke out involving as many as 30 young women, authorities said.

The fight began about 2:30 p.m. Monday in South Los Angeles. Police said one of the women jumped into her car and struck the three victims. The woman killed was eight months pregnant and another victim was in critical condition and expected to lose her leg, authorities said. None of the victims’ identities were released.

Unique Bishop, 21, fled but turned herself into authorities and was booked for investigation of murder, police said. She is being held on $1 million bail.

Police said the cause of the dispute is unclear, but was part of a planned confrontation between two groups of women in their early 20s. Witnesses told police they saw women shout at each other and fighting at a parking lot for a discount store. The fight then moved its way onto the street and into a gas station.

Dozens gathered at the gas station and watched as Bishop get into her convertible vehicle and drive it into the group. One of the victims was pinned against another car, police said.

“It was totally an intentional act to kill the woman. It was the driver’s way of settling the dispute. It was a horrific act,” said LAPD Deputy Chief Charlie Beck.

Police believe the fight involved only women, which was “very unusual,” said police Cmdr. Pat Gannon.

“We have seen women around gangs before, but we haven’t seen anything like this event before,” he said.