Two middle school students died Friday when their school bus collided with a dump truck and a passenger vehicle on Highway 70 in Carroll County, Tennessee, PEOPLE reports.

The Tennessee Highway Patrol responded to the three-vehicle crash around noon on March 27. More than 20 Kenwood Middle School students and five adults were aboard the Montgomery County school bus when it collided with a Tennessee Department of Transportation dump truck and a passenger car, according to a news release. Two adults were in the dump truck and one person was in the passenger vehicle.

“The school bus was transporting students on a field trip. Tragically, two students on the bus were killed,” the Tennessee Highway Patrol said in the news release. “Several others were injured, with multiple airlifted to trauma centers in Nashville and Memphis.”

The bus was headed to a GreenpowerUSA event in Jackson when the crash occurred. Authorities have not released the names or ages of the deceased students.

Emergency responders deployed nine air ambulance helicopters to transport the injured to medical facilities across the region. Baptist Memorial Hospital-Carroll County treated 19 patients, while Monroe Carell Jr. Children’s Hospital at Vanderbilt in Nashville received four pediatric patients, according to reports. A Vanderbilt Health spokesperson confirmed those patients are in stable condition.

The Clarksville-Montgomery County School System released a statement following the crash.

“Our hearts are shattered at the tragic loss of two young lives,” the district said on a social media post. “We continue to pray for the students and employees injured and everyone who was affected by today’s accident.”

Montgomery County Mayor Wes Golden said the incident has deeply affected the community.

“My family and I are grieving alongside the families, friends, and staff of Kenwood Middle School,” Golden said in a statement. “This is every parent’s worst nightmare, and it has shaken our close communities.”

The Tennessee Highway Patrol is investigating the cause of the collision. Officials have not released additional details about the circumstances surrounding the crash.

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