Over 40 Dallas police units responded to a bomb threat at North Dallas High School on Tuesday morning.

Police initially responded to the school after reports of a bomb threat in the 3100 block of North Haskell Avenue around 7:56 a.m., according to a police statement.

What we know

Police began moving children away from the school and searching the building around 8 a.m., approximately an hour before school was scheduled to open, according to police dispatch calls. It was the students’ first day back after the holiday break.

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Access to the school, which sits off of McKinney Avenue, was blocked off by police motorcycles as far out as Cityplace West Boulevard.

As of 9:20 a.m., more than a dozen uniformed officers stood outside on the school’s concrete steps, moments after a police dog was led inside.

After securing the campus, officers determined there was no credible threat. The Dallas ISD Police Department will continue the investigation, the statement said.

Around 10 a.m., police began allowing students and teachers into the school, though they were using a side entrance and not a main stairwell.

School buses began to arrive at the school shortly after 10:10 a.m.

What we don’t know

DISD has not yet commented on the situation.

This is a developing story.