@CNN: Columbine High School, site of a 1999 massacre by two students, was shut down after receiving bomb threats, the Jefferson County Sheriff’s Office said. Authorities conducted a search, found no suspects, and decided the threat was baseless. https://t.co/l7WrnfcKUg https://t.co/4kmF7j5JIO

@CNN: Columbine High School, site of a 1999 massacre by two students, was shut down after receiving bomb threats, the Jefferson County Sheriff’s Office said. Authorities conducted a search, found no suspects, and decided the threat was baseless. https://t.co/l7WrnfcKUg https://t.co/4kmF7j5JIO