Derby High School was evacuated after workers hit a gas line and caused a leak at the building on Thursday morning, police said.
The gas leak was reported in the area of Nutmeg Avenue just before 10 a.m. The leak occurred when workers working on the roof hit a line, according to the mayor's office.
No students were inside the building and only the workers had to be evacuated, town officials said.
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The Islamic State militant group released a video Tuesday that it claimed shows the beheading of American journalist Steven Sotloff.