VANCOUVER, Wash. -- An 11-year-old middle school student accused of bringing a handgun, more than 400 rounds of ammunition and multiple knives to his school was arrested Wednesday night, police said.

Officers were called to Frontier Middle School at about 9:30 a.m. Wednesday to investigate a report that ammunition had been found there. Police located the ammunition and multiple weapons. There were no reports of injuries.

The suspect was interviewed by detectives and arrested for investigation of one count of attempted murder, Vancouver police spokeswoman Kim Kapp said in a statement late Wednesday night. A major crimes team was investigating.

The boy was not identified. He was booked into the Clark County juvenile detention center, Kapp said.

The middle school and adjacent Pioneer Elementary School were locked down for about two hours during the initial investigation. Some parents said the district should have been more forthcoming, and informed them sooner, about the incident.

More: Parents at odds over handling of gun incident

An estimated 900 students attend the middle school and about 600 attend the elementary school, The Columbian reported.

Parents were primarily alerted about the ammunition and weapons find through the Frontier and district Facebook pages, along with the district website, said Kris Fay, Evergreen Public Schools spokesman. The district does not have an emergency phone or text system.

While middle school students were sent home with an explanatory letter, elementary school students did not get a letter because they were on an early release schedule, Fay said.

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