An 18-year-old man who met a woman on a dating phone app has been charged with sexual assault, according to the Anchorage Police Department. But the agency added she might not be his only victim.

On Friday, APD’s Special Victims Unit was notified of an assault involving a 20-year-old woman and Jim Persey.

Police said the two met on the dating app known as “Meetme.” According to APD, the two made a plan to meet and have consensual sex.

“During the act, the victim stated she was physically assaulted by Persey and when she asked for the engagement to stop, he would not comply with her requests,” police wrote in a release.

During the attack, Persey threatened the woman with a knife.

He is charged with first-degree sexual assault and second-degree assault.

On April 4, another assault involving Persey had also been reported to police. The woman told police, she did met Persey online a couple of months prior.

“Due to the violent nature of the assaults and the method in which Persey used to meet his victims, there is concern that there could be more victims of Persey,” police said.

Anyone with additional information is asked to call APD detective Chris Thomas at 907-786-2628.