A threatening message through its website prompted Northwestern Lehigh School District to go into lockdown mode for several hours Tuesday morning.

Contacted Tuesday afternoon, Assistant Superintendent Jennifer Holman said the district received a message early yesterday morning on its website, nwlehighsd.org.

"We received a message at about 7 in the (Tuesday) morning, sent through our school district contact forum on our website, that there was a threat that was going to happen (Tuesday)," Holman said. "We did already have the buses on the road on their way to the high school for their drop-off."

As a result, the district held students on their buses until state police arrived, Holman said.

"State police helped us with a search of the high school, and while they searched, all the students were taken to the middle school, where all student bags and purses were searched," she said. "After the high school was safe and they found nothing, the high school students came back to the high school by 10:30 a.m."

Holman said no weapons or explosives were found during the search.

However, the situation caused Northwestern Elementary and Weisenberg Elementary schools to operate on a two-hour delay, strictly due to the transportation delay because the buses were at the high school, Holman said.

"All the students are back in their respective schools, back to their respective schedules, very fortunately," she said. "It was certainly something we wanted to use precaution with."

Holman said the district is glad to report the safety of its students.

"We ran through an exercise we will certainly learn from, and the precautions were for the student safety," she said. "That was our number one concern."