BATTLE GROUND, Clark County — A 13-year-old boy was arrested Wednesday after threats prompted the closure of six Southwest Washington schools, police said.

The closures affected nearly 4,300 students.

Multiple, written threats that police described as credible were made Tuesday against Chief Umtuch Middle School in Battle Ground. The boy is a student at that school, police Sgt. Aaron Kanooth said in a statement.

“Officers have determined that the suspect did not possess the means to carry out any of the threats that were made,” Kanooth said, adding there is no evidence anyone else was involved.

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Police interviewed the boy, seized his computer and released him to his parents, Kanooth said.

The investigation will be forwarded to the Clark County juvenile prosecutor with a recommendation for charges of felony harassment, Kanooth said. Police did not release the teen’s name.

The five Battle Ground schools that closed Wednesday as a precaution will reopen Thursday, school-district spokesman Gregg Herrington said.

Chief Umtuch was closed, as were four other schools on the same campus.

A nearby private school also closed as a precaution. A spokeswoman for that school did not immediately return a phone call.

Battle Ground, with a population of about 18,000, is part of the Portland-Vancouver metro area.