Hempstead High School was locked down on Wednesday due to an unspecified threat, a hoax that is being investigated, the police said.
“They did receive a threat and it turned out to be unfounded,” a Hempstead police officer said by telephone.
“It’s still under investigation,” he added.
Officers remained on the President Street campus until the school day ended at about 3:20 p.m., he added.
Earlier, a spokesman for the police department said authorities received a call about the threat at about 1 p.m.