A 27-year-old Rockville man has been arrested in connection with the 2010 sexual assault of a pregnant woman.

Acting on a tip, Montgomery County police arrested Jose Antonio Quintano-Claros on Wednesday.

The incident happened on June 13, 2010, authorities said. At about 12:32 a.m., police responded to a report of a sexual assault near Aspen Hill and Veirs Mill roads. The 26-year-old woman had just gotten off a bus and was walking along Viers Mill Road when she was accosted by two males, authorities said. The men forced the woman into a wooded area along the road and sexually assaulted her, according to police, and one man threatened the victim with a knife. The woman’s assailants also took her purse before fleeing the scene, police said.

Although police were able to identify Quintano-Claros as a suspect, he fled the country before he could be arrested. During a police interview after his arrest, authorities said Quintano-Claros admitted to being involved in the assault, providing details of the incident that were not known to the public. He is being held on a $10 million bond.

The second suspect has not been identified, but investigators were told in 2010 that he went by the nickname of “El Brown.” He is described as a Hispanic man in his mid-20s, about 5 feet 5 inches to 5 feet 6 inches tall, weighing about 150 pounds, with short, dark hair. Police have released a composite sketch of the suspect.

Anyone with information about him or the case is asked to call the Major Crimes Division at 240-773-5070.