Bomb threats

CORRECTS TO SAY WHAT AUTHORITIES THOUGHT WERE THE REMNANTS OF AN EXPLOSIVE DEVICE TURNED OUT TO BE A NONEXPLOSIVE DEVICE - Marnie Wedgwood hugs her son evacuated from the Rossiter Elementary School in Helena, Mont., Tuesday, Oct. 15, 2019, after authorities found what they thought were the remnants of an improvised explosive device on the school playground. Authorities evacuated the elementary school in Montana's capital city Tuesday after officials found the unknown materials, but they turned out to be a plastic bottle filled with nuts and bolts left in the schoolyard. (Thom Bridge/Independent Record via AP)

FILE - In this Feb. 9, 2015 file photo, an honor guard stands at the entrance before ribbon cutting ceremonies for the new 1st Infantry Division Headquarters at Fort Riley, Kan. Prosecutors say a U.S. Army infantry soldier stationed at Fort Riley shared bomb-making instructions online and also discussed killing activists and bombing a news network. The Justice Department says Monday, Sept. 23, 2019, that private first class Jarrett William Smith was charged with distributing information related to explosives and weapons of mass destruction. (AP Photo/Orlin Wagner File)

An investigator bags a suspicious package as evidence after it was thought to be an explosive device in Manhattan's Chelsea neighborhood Friday, Aug. 16, 2019, in New York. The scare happened about two hours after two abandoned objects that looked like pressure cookers prompted an evacuation of a major transit hub in lower Manhattan. The police bomb squad later determined they were not explosives. (AP Photo/Kevin Hagen).

FILE - This Feb. 27, 2014 file photo shows New York City taxis passing through New York's Times Square. A New York man who talked about wanting to throw a grenade in Times Square has been arrested and is expected to be arraigned Friday on weapons-related charges, law enforcement officials told The Associated Press. (AP Photo/Richard Drew, File)

Secretary of State Mike Pompeo arrives at a classified briefing for members of Congress on Iran, Tuesday, May 21, 2019, on Capitol Hill in Washington. (AP Photo/Patrick Semansky)

In this undated photograph obtained by The Associated Press, a UAV-X drone flown by Yemen's Houthi rebels is seen in Hodeida, Yemen. A Yemen rebel drone strike this week, likely by UAV-Xs, on a critical Saudi oil pipeline shows that the otherwise-peaceful sandy reaches of the Arabian Peninsula now are at risk of similar assault, including an under-construction nuclear power plant and Dubai International Airport, among the world's busiest. (AP Photo)

FILE - In this frame grab from a video released In this Oct. 15, 2017, file photo and provided by Furat FM, a Syrian Kurdish activist-run media group, shows Syrian Islamic State group fighters who have surrendered, at a base of the U.S.-backed Syrian Democratic Forces (SDF), in Raqqa, Syria. (Furat FM, via AP, File)

Forensic experts search the area outside the Russian consulate in Athens, Friday, March 22, 2019. Police say a bomb disposal squad has been sent to the Russian consulate in Athens after cameras showed a suspicious object believed to be a hand grenade being thrown over the perimeter fence overnight. (AP Photo/Thanassis Stavakis)

FILE - This Aug. 30, 2015, file photo released by the Broward County Sheriff's office shows Cesar Sayoc in Miami. Sayoc, who is charged with sending pipe bombs to prominent critics of President Donald Trump, is expected to plead guilty at a hearing in New York on Thursday, March 21, 2019. (Broward County Sheriff's Office via AP, File)