Police searched a high school room by room Thursday after a cook reported seeing two suspicious men in the building around dawn, both wearing camouflage and one in a ski mask.
Authorities said no classes or groups were meeting in Boulder High School at the time. Police sealed off the building, and school officials canceled classes for the day.
A four-hour search by 23 officers in three SWAT teams found no signs of a break-in, Police Chief Mark Beckner said. The search included utility-access tunnels under the building and at one point two officers could be seen on the roof, their rifles drawn.
Beckner said there was no indication the intruders were armed.
“This could be a spring, end-of-school-year prank. It could be a burglary. It could be kids goofing around, or it could be more serious,” Beckner said. “Given the times that we live in and recent events, we have to take all precautions.”
Beckner said the cook spotted the men around 6 a.m. in the first-floor cafeteria of the three-story building, and that they ran when she yelled at them. She described them as young but was unable to describe their faces, Beckner said.
Beckner said a witness reported seeing three or four people dressed in black on a bike path near the school at 4:30 a.m., one of them wearing a ski mask. The witness described having a casual conversation with them, Beckner said.
Video from one of 15 surveillance cameras outside the school showed two people running away from the school at 5 a.m., Beckner said. The school has no interior surveillance cameras, officials said.
Chris King, deputy superintendent of the Boulder Valley School District, said all the doors should have been locked at 6 a.m., but school officials had not been able to verify that they were. The only employees known to have been inside were the cook and two custodians, who customarily disarm the school’s alarm system when they arrive.
No threats made
At a nearby snowboard shop, Boulder High freshman Jake Hanifin, 15, and his friends said the incident didn’t sound like a prank.
“I think it’s hard to believe it’s a joke if a kid comes in with a ski mask,” he said. “To push a joke to that limit would be pretty intense.”
No threats had been made against the 1,900-student school in recent days, the police chief said. Earlier this spring, graffiti had been found inside the building saying people would die on April 19, the day before the anniversary of the Columbine High School shootings near Denver. Classes were held that day with extra security, he said.
The University of Colorado alerted students, faculty and staff on parts of the campus near the high school, but no classes or other activities were interrupted, the university said.