PLYMOUTH, Mass. (AP) _ Officials say they are increasing security at a Massachusetts prisons detox facility after 12 patients escaped in less than a month.

WFXT-TV reports that the Massachusetts Correctional Institution in Plymouth houses a detox center previously housed at Bridgewater State Hospital. People with drug addictions are sent to the facility to detox on a judge's order, often against their will.

This Sunday marked the third time since the center relocated on May 1 that a patient undergoing treatment has escaped. Residents say the escapes are a concern, especially with children in the neighborhood.

In a statement, the Department of Correction says it is installing fences at the facility. The prisons department says it anticipates having some fencing in place ``as early as three weeks from now.''