BOSTON (AP) – Staff members at a group home made multiple mistakes when they followed a prank caller’s direction to give dozens of electrical shocks to two emotionally disturbed teenagers, according to a report by a state agency that investigated the incident.

The report by the Massachusetts Department of Early Education and Care said six staffers at a Stoughton residence run by the Canton-based Judge Rotenberg Education Center had ample reason to doubt the orders to administer the shocks, but did nothing to stop it.

The six staff members and video surveillance worker on duty that night have been fired, Ernest Corrigan, the school’s spokesman, said Thursday.

After the Aug. 26 call, the teens, ages 16 and 19, were awakened in the middle of the night and given the shock treatments, at times while their legs and arms were bound. One teen received 77 shocks and the other received 29. One boy was treated for two first-degree burns.

The caller posed as a supervisor and said he was ordering the punishments because the teens had misbehaved earlier in the evening. But none of the staffers had witnessed any problems, and other boys said the two teens had done nothing wrong. One boy suggested the call was a hoax.

The report says the caller was a former resident of the center with intimate knowledge of the staff, residents and layout of the Stoughton home. No motive was given and the caller’s identity wasn’t disclosed. Police are looking into filing criminal charges.

Five of the six staffers had worked a double or triple shift and most had been on the job less than three months. The staffers were described as concerned and reluctant about the orders, but failed to verify them with the central office or check treatment plans to make sure the teens could receive that level of shock therapy, the report said. Staffers also didn’t know who the shift supervisor was that night.

Staff members realized their mistake after someone finally called the central office.

One reason staffers might not have been suspicious of the phone call is that the Rotenberg Center uses surveillance cameras in its group homes to monitor residents and staff, and a central office employee is allowed to initiate discipline by phone.

As a result of the investigation, the center has expanded staff training, implemented new telephone verification procedures, added oversight at group homes and eliminated delayed punishment.

Corrigan said an incident like the faulty shock treatments after a phone call has never happened before.

“It was a perfect storm of things that went wrong that night,” he said.