Hampton Bays High School was evacuated for two hours Wednesday morning after a "loud bang" was reported in the front lobby area of the school.
That loud bang, according to Southampton Town Police, turned out to be from a blown tire of a hand truck that was located in lobby.
The school went into an immediate lockdown around 8:30 a.m. and students were relocated to the middle school in accordance with the school district safety plan, according to a message on the school's website.
There were no injuries and students were permitted to return to the school by 10:30 a.m. following an extensive search of the building by security staff, Town Police officers, Town Fire Marshals and the New York State Police K-9 unit, Southampton Town Police said.
The tire that exploded had been recently inflated, police said.
"Safety is the utmost priority of the Hampton Bays School District and we we appreciate the participation and support of local law enforcement, staff, and parents in the effective execution of the School District Safety Plan," the message on the school's website reads.