The men are described as African-American males, both in their 20s. One is 5 feet 7 inches and 195 pounds with a mustache and goatee. The other is 6 feet 2 inches and 175 pounds.
Investigators say they sexually assaulted and robbed a 26-year-old woman at gunpoint near the West Oakland BART station two weekends ago.
They then forced her to take them to her apartment where they sexually assaulted and robbed her two roommates.
A $30,000 reward is being offered for information about the assaults. Anyone with information can call police investigators at 510-238-3641, or Crime Stoppers at 510-777-8572 or 510-777-3211.