A second day of training exercises at the Portsmouth Naval Shipyard Thursday will involve the use of the yard's speaker system.

A message to shelter in place will be heard during the exercise, which is scheduled to start at 9 a.m., according to the shipyard's public affairs office. The training exercise takes place in several areas around the shipyard, and will be heard multiple times.

The public may also see the shipyard's security team responding to the event. No action is required by the public.

This exercise is designed to enhance the training and readiness of the shipyard's Security Force, according to the shipyard's public affairs office.

The exercise comes two weeks after a false announcement ordering the evacuation of beaches was aired on 9 of 121 Seabrook Station sirens within the 10 mile zone around the nuclear plant.

NextEra Energy Seabrook Station told Gov. Chris Sununu in a letter that it is "conducting a thorough investigation and we will take actions to ensure this situation does not happen again." The company has not yet provided an explanation.

Contact reporter Dan Alexander at Dan.Alexander@townsquaremedia.com or via Twitter @DanAlexanderNH

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