OAKLAND -- Up to $5,000 in reward money is being offered for information leading to the arrest of three men who kidnapped a 13-year-old girl at gunpoint last week in East Oakland and sexually assaulted her before dropping her off across town in North Oakland near UCSF Benioff Children's Hospital, authorities said.

The abduction happened about 11 a.m. June 6 as the girl was walking in the 9200 block of Coral Road, just south of Interstate 880 in the Brookfield Village area, police said. A newer model burgundy four-door sedan with a light-colored interior pulled alongside the girl, and three men forced her inside at gunpoint.

She was then sexually assaulted, but police did not say if the attack happened in the car or elsewhere. The men dropped her off later in the 5500 block of Dover Street, police said.

The girl gave basic descriptions of the suspects, who were described as black males.

One was 17 to 19 years old, about 6 feet 1 inch tall with a medium build and a medium complexion.

The oldest suspect was described as 20 to 25 years old, standing 6 feet 5 inches with a thin build and a light complexion. She said he had a 1- to 2-inch scar on the left side of his chin.

Another suspect was 17 to 19 years old and standing 6 foot 2 with a thin build and a dark complexion. She did not give police any description of their clothing, hair or eye colors.

The reward money is being offered by police and Crime Stoppers of Oakland. Anyone with information is asked to call the youth and family services unit at 510-238-3641 or 855-847-7247 or Crime Stoppers at 510-777-8572.

Staff writer Harry Harris contributed to this report. Follow Kristin J. Bender at Twitter.com/kjbender.