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SAN LEANDRO – A rookie Oakland police officer is set to be arraigned Friday on charges that he allegedly had sexual relations with two high school students, police said. 

Efrain Cintron, 22, of San Francisco, is charged with four counts of unlawful sexual intercourse with a minor, three counts of oral copulation with a minor, and three counts of penetration with a foreign object of a minor, all felonies, police said. He is also charged with three misdemeanor counts of inappropriate touching of a minor. 

San Leandro police Lt. Steve Pricco said the alleged victims are two girls, one 16 and the other 17, both students at San Leandro High School. 

The investigation began Sept. 2 when the 16-year-old girl approached police. 

“She was very uncomfortable with the relationship,” Pricco said. The 17-year-old has not cooperated with investigators. 

The alleged crimes occurred between July 20 and Aug. 24 at different locations in San Leandro, San Lorenzo, Hayward and San Francisco.  

According to Pricco, Cintron and the two victims were “mutual friends” who had known one another for a few years. 

Pricco said Cintron graduated from the Oakland Police Academy within the last several months and has been placed on administrative leave.