( CNN ) -- A zip gun was found at a Houston-area high school Monday after the building was evacuated over fears of an unspecified , perceived threat , the Katy Independent School District said . The device was secured and the building was cleared . A student was taken into custody and charges are pending , the school district said in a statement on its website . It described a zip gun as any device altered to propel an object designed to cause harm . Seven Lakes High School in Katy was evacuated Monday after police `` learned of a perceived threat on campus '' about 10 a.m. CT , and students initially were sent to an enclosed area on the school 's athletic fields , the district said . About an hour later , authorities told district officials that a possible bomb was found in the building . The FBI sent bomb technicians to help the county bomb squad in the case , said Agent Shauna Dunlap , a spokeswoman for the FBI in Houston . Video from CNN affiliate KTRK showed a number of emergency vehicles parked outside the school early Monday afternoon . Katy is about 25 miles west of Houston . Seven Lakes High has more than 3,800 students , according to its website .
NEW : Seven Lakes High School in Katy is safe for students to return . NEW : A student was taken into custody and charges are reportedly pending . NEW : A zip gun is a device altered to propel an object to cause harm .