BOULDER, Colo.—A 16-year-old boy charged with bringing a pipe bomb to his Lafayette high school wants a Boulder judge to close court hearings to the public.

Andrew de Bartolome is charged as an adult with attempted murder, use of explosives, possession of an explosive and menacing in connection with the May 13 incident at Centaurus High School, which forced the evacuation of the school. A teacher found the explosive in a paper bag and took it outside. A Boulder County bomb squad later detonated it.

De Bartolome’s attorneys filed a motion Aug. 15 asking that two hearings be closed to the public. A preliminary hearing is set for Aug. 28, and on Oct. 9 a judge will be asked to determine whether the case should remain in district court or be transferred to juvenile court.

The Boulder District Attorney’s Office had yet to file a response, the Daily Camera reported Thursday ( http://tinyurl.com/kjcofsz).

Boulder County deputies were called to de Bartolome’s house in February because his parents reported he was making explosives in his room, the Camera said.

DENVER — Colorado energy regulators on Monday proposed tighter rules for shutting down oil and gas pipelines after a fatal explosion blamed on natural gas leaking from a line that was thought to be out of service but was still connected to a well. The Colorado Oil and Gas Conservation Commission rules govern flow lines, which carry oil, gas and...