Bomb threats at more than a dozens schools in U.S. Northeast, Midwest
At least nine schools in New Jersey received phone call threats starting at about 8:50 a.m. EST, said Bergen County Sheriff spokesman Anthony Cureton, adding that four had later been given the all clear.
Searches were still underway at five other schools, he said.
The threats - which may have been automated because they were so similar - were dialed in to high schools in Teaneck, Garfield, Tenafly, Clifton, Fair Lawn, Leonia, Bergenfield, Englewood and Hackensack, all in Bergen County, Cureton said.
He said he could not confirm a media report that one of the schools had also been threatened with a mass shooting.
In Massachusetts, Arlington High School just outside Boston was evacuated and students were dismissed for the day early on Tuesday after officials reported a threat of a possible attack using bombs and guns, local police said.
Police said on Twitter they did not regard the attack as credible but that the evacuation was carried out as a precaution. Arlington police said they later determined the threat to be "unfounded."
Nine Boston-area schools were the targets of similar threats on Friday.
Delaware State Police said they were investigating threats made to at least three schools.
The threats made at about 9:30 a.m. on Tuesday resulted in elementary schools in Millsboro, Middletown and a high school in Greenwood being evacuated, police said in a statement. Police did not release information about the nature of the threats.
Iowa City West High School, in Iowa City, also received a phoned-in bomb threat on Tuesday, according to local media. The call was received at about 8:40 a.m. and forced students and faculty to be transported to an off-site location. Neither the school district nor city police could immediately confirm the reports.