LOS ANGELES (CNS) – Two veteran Los Angeles Police Department officers are facing charges of sexually assaulting four women — with most of the alleged attacks occurring while they were on duty, the District Attorney’s Office announced.

James Christopher Nichols, 44, and Luis Gustavo Valenzuela, 43, who worked as partners in the Hollywood Division, are scheduled to be arraigned Thursday at the downtown criminal courts building.

Nichols, a 15-year LAPD veteran, is charged with five counts each of forcible rape and rape by threat to arrest or deport and one count each of forcible oral copulation, oral copulation under color of authority, attempted forcible oral copulation, attempted oral copulation under color of authority and sexual battery.

Valenzuela, who has been with the department for 18 years, is charged with three counts each of forcible rape and rape by threat to arrest or deport and one count each of forcible oral copulation, oral copulation under color of authority, attempted forcible oral copulation, attempted oral copulation under color of authority, assault with a firearm and sexual battery.

The charges stem from a series of alleged attacks on four women between 19 and 34 years old beginning in December 2008, after the two officers became partners, and continuing through March 2011 at various locations, including in their police vehicle, according to prosecutors.

All four of the women were arrested at various times by the officers in connection with narcotics-related offenses, and most of the alleged assaults occurred while the officers were on duty, according to the District Attorney’s Office.

Nichols and Valenzuela could face up to life in state prison if convicted of the charges.

According to the LAPD, both officers have been “relieved from duty” without pay, but are still with the department.

“I will say again, any officer that abuses the public’s trust is not welcome in the LAPD and we will continue vigorously investigating officers accused of alleged crimes and cooperate fully with the District Attorney’s Office,” Chief Charlie Beck said.