After a woman escaped from a makeshift “dungeon” made of cinder blocks in a man’s Oregon home, the FBI says it is looking for additional victims in other states.

The man, 29-year-old Negasi Zuberi, was taken into federal custody on suspicion of kidnapping across state lines after a woman from Seattle escaped from his home in Klamath Falls, Oregon, according to a news release from the FBI Portland Field Office. The woman also said she was sexually assaulted, the FBI said.

Zuberi, who has lived in at least 10 states since 2016, has been linked to violent assaults in at least four states, according to the FBI. Investigators have reason to believe there could be several other victims, the agency said. Zuberi was indicted by a federal grand jury in Oregon on one count of kidnapping and one count of transportation with intent to engage in sexual activity, court documents filed Wednesday show.