Glen Burnie High School briefly evacuated Tuesday morning after some students became ill. The school's principal, Kevin Carr, sent a letter to parents and guardians saying several students went to the health office feeling ill around 11:30 a.m., possibly due to a gas odor."In accordance with safety procedures, Building F (the old main building) was evacuated as emergency response was dispatched," Carr said in his letter.Carr said the ill students were taken to hospitals as a precaution.After about 15 minutes, officials deemed the building safe for re-entry, Carr said. The odor is believed to be residual from equipment related to ongoing construction on campus.