Norwich — The Norwich Free Academy campus will be crowded with police, fire, ambulance and other emergency vehicles after school Thursday as part of an emergency response drill.

The emergency vehicles will arrive after students are dismissed, NFA officials announced on the school website, nfaschool.org.

“We expect a number of first responder vehicles on campus,” the school announcement said. “Please be advised this is only a drill, as we continue to train and improve our emergency response.”