PORTLAND, Ore. (AP) — A former nursing assistant at a Portland hospital has been arraigned on 18 charges, including rape and kidnapping.

KATU-TV reports (https://goo.gl/CndN8J ) that in court Thursday, Adeladilew Mekonen was arraigned on first-degree rape, first-degree kidnapping, four counts of sexual penetration and 12 counts of sex abuse. His bail was set at $1 million.

Investigators said nine people claim they were sexually abused by Mekonen. Two patients, ages 87 and 94, at Providence St. Vincent Medical Center are among them.

Mekonen worked as a caregiver at the West Hills Health & Rehabilitation Center before he was hired at Providence. Detectives say they are concerned there could be more victims.

Anyone with helpful information is asked to call 503-846-2500.

It wasn't immediately clear whether Mekonen has an attorney.

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Information from: KATU-TV, http://www.katu.com/