Cedar Hill High School was placed on lockdown for several hours on Wednesday because police learned of a possible bomb threat.
According to a statement released by the CHISD, the potential threat came from text chatter between high school students.
Officials ordered the lockdown at about 8:10 a.m. and police cleared the school, using bomb-sniffing dogs to investigate the building.
Some students who were taking a four-hour STAAR exam were evacuated from classrooms for an average of about five minutes while police checked the rooms and declared them safe, the district said.
Students who were scheduled to take the test but were not allowed to enter the building during the lockdown will be allowed to make up any missed tests this week, it said.
KDFW FOX 4
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