HOLLIDAYSBURG, Pa. (AP) — A former guard at a Pennsylvania county prison is on trial for charges that he sexually assaulted a nurse two years ago.

The Altoona Mirror reports that former Blair County Prison guard Paul Keefer, of Duncansville, is accused of inviting the woman into the room where he was working, grabbing her breasts, forcing her to touch him and refusing to let her leave. Prosecutors say the assault ended when another employee came to the room looking for a key.

Keefer's attorney says the allegations are false. He says Keefer had an excellent record at the prison, where he worked for 11 years before he lost his job.

Prosecutors say surveillance video shows the woman outside the room where Keefer worked, but there is no video of the encounter.

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Information from: Altoona Mirror, http://www.altoonamirror.com