ANDREWS – Another federal agency has been added to assist with the investigation into bomb and gun threats aimed at Andrews High School last week, according to local authorities.The threats resulted in evacuating students and staff on the morning of Feb. 23 and bringing in bomb squads from Midland and Odessa. A thorough search revealed no bombs or devices at the school, authorities said.The U.S. Department of Homeland Security was added to the list of investigating agencies this week, police said.“I talked to them this morning and they know about everything we know (about the case),” a police office spokesman ...