BOSTON >> A group of sex offenders are suing the Massachusetts Department of Correction, alleging prison officials unlawfully detained them after they were ordered to be released from custody.

The Boston Globe reports lawyers for dozens of convicted offenders filed a civil complaint in U.S. District Court in Boston.

Offenders deemed "sexually dangerous" are held indefinitely at the Massachusetts Treatment Center — run by the DOC — after their prison terms. But they are entitled to trials where a judge or jury can decide that they're no longer dangerous.

The plaintiffs allege the DOC routinely holds inmates who've been ordered freed for a day or more while officials complete the process of notifying agencies of their release.

They're seeking $5 million in damages.

The DOC says it won't comment on pending litigation.