Two Rikers Island guards are accused of orchestrating an attack on an inmate to settle a personal score and later falsifying records to cover it up.

Nakia Gales and Herman Jiminian have been charged with assault, falsifying records and official misconduct in the January 2014 attack on inmate Gilbert Bacallao.

Gales pleaded not guilty to the charges Thursday. She was suspended without pay.

Jiminian was scheduled to be arraigned Friday.

It's not clear if they had lawyers who could comment on the charges.

New York prosecutors say Gales locked Bacallao in a vestibule area where four other inmates attacked him.

The president of the correction officers union says he's troubled by the allegations. But he says the officers have a right to a vigorous defense under the law.