A staff sergeant in the U.S. Air Force is suspected of sexually assaulting at least four women, according to police. Desmond Alvis Martin was arrested on Feb. 15 after investigators identified him as a suspect in three Colorado Springs rapes in 2015, and one rape this year in Aurora, Colo..

Martin, 29, is a staff sergeant assigned to Peterson Air Force Base in Colorado Springs. Authorities announced the arrest and alleged rape pattern on Tuesday.

Investigators with the Colorado Springs Police Department Special Victims Section, the Aurora Police Department Sex Crimes Unit, the Denver Police Department Sex Crimes Unit and the United States Air Force Office of Special Investigations are all continuing to pursue possible additional leads.