In a statement issued on Thursday, the Metropolitan Police Department announced the teenager, whose name was not released, was arrested by law enforcement officers who continue probing into the bomb threats.

The four high schools and three charter schools, which were evacuated following Wednesday’s bomb threats and later cleared, included Dunbar High School, which was threatened on Tuesday during a visit by US Vice President Kamala Harris’ husband.

No explosives were found at any of the schools, police said, but threats are being probed by the FBI.

Authorities have not indicated a connection to race in the spate of bomb threats, and police said Tuesday’s incident did not appear to be targeted at Harris’ husband, Douglas Emhoff, who was visiting Dunbar for a Black History Month event.

Ms. Harris´ husband was giving a speech to the students as he suddenly had to be escorted out.

Local authorities said the incident at Dunbar, considered the first Black school in the United States, did not appear to have targeted Mr. Emhoff.

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