New video released on Friday shows a violent attack on corrections officers carried out by inmates at the Souza Baranowski ...

"The video shocks the conscience," said the union, which is pushing for security reforms across Massachusetts prisons.

Five officers were taken to hospitals for treatment. One was stabbed 12 times, and another suffered a punctured lung.

“The video shocks the conscience,” the Massachusetts Correction Officers Federated Union Executive Board said in a statement.

Video of the attack on correction officers at a maximum-security prison in Lancaster, Massachusetts has been released. WBZ-TV ...

"The video shocks the conscience," the union's executive board said in a statement. "Suffice it to say the Executive Board of ...

The five officers at the Souza-Baranowski Correctional Center in Lancaster were taken to hospitals after the confrontation ...

New surveillance video shows the moment a pair of inmates attacked correction officers at Souza-Baranowski Correctional ...

WARNING: The above video is graphic, and some people may find it hard to watch. Surveillance video was released Friday ...

Two correctional officers were stabbed by inmates at a maximum-security prison in Massachusetts, with three others suffering ...

Tensions are high inside and outside the Souza Baranowski Correctional Center after two correction officers were stabbed.

Dennis Martin, president of the Massachusetts Correction Officers Federated Union, said Thursday that the officer who was stabbed 12 times remained hospitalized.