The boy, a student at E.B. Walker High School in Puyallup, was arrested late Thursday for investigation of six counts of weapons theft, said Pierce County sheriff's spokesman Ed Troyer. He is being held at Pierce County's juvenile facility.

Also arrested were two boys to whom he allegedly provided the guns. Those boys, 15 and 16, are students at Todd Beamer High School in Federal Way.

Three of the guns were discovered in the possession of the 15-year-old Todd Beamer student on Thursday, prompting an hourlong lockdown on campus. Investigators found the other three guns in a garbage bin outside the 16-year-old's apartment in Federal Way, the Federal Way School District reported.

State Patrol spokesman Mark Lewis said it was not yet clear how the boy who took the weapons to school knew the boy who stole them.

Officials said the student who brought the loaded weapons to class told investigators he had no plans to harm anyone.

No one was injured, and the student was arrested without incident and put in jail.

The student, a 10th grader at Todd Beamer High School whose name was not immediately released, said he intended to sell the handguns that a school police officer found in his backpack, Federal Way police spokeswoman Stacy Flores said. He made a court appearance in King County on Friday; a judge ordered him to remain in custody.

The hourlong lockdown began around 12:45 p.m., after a school police officer got a tip from a mother whose daughter had sent a text message saying she thought a student might be carrying weapons, district spokeswoman Debra Stenberg said.

The police officer and principal went searching for the student, located him in a hallway, and found he was carrying three firearms and additional ammunition, Stenberg said.

"It's nerve-wracking. You're always wondering what's going on and I just directed my staff to stay where they were until we knew," said Josh Garcia, the principal.

The weapons had been in a gun safe, but Troyer did not know if the safe was locked. He was not sure if any service revolvers were involved, but he said that was unlikely.

Students at Todd Beamer were sent home after the lockdown was ended at 1:51 p.m., about 15 minutes before the normal end of the school day, Stenberg said.

Washington State Patrol spokesman Mark Lewis declined to release the name of the trooper. The theft investigation is being handled by the Pierce County sheriff's office, he said.

About 100 miles southeast in Yakima, Davis High School was also locked down Thursday afternoon after a threatening note turned up in a boys' bathroom. School officials wouldn't comment on the note's contents, but administrators identified a student they believed wrote the note and turned him over to police.

School officials locked down the high school last week after another note was left in the boys' bathroom April 12. That note warned that a particular student had a gun and planned to use it, but an extended search of the building turned up no weapon.

Police arrested a 16-year-old boy Monday in connection with the first incident.

In Lynnwood, north of Seattle, police on Thursday arrested a 16-year-old accused of making a bomb threat at Edmonds Community College earlier in the day. The boy is a student at the college and was arrested at his home.

Investigations Cmdr. Steve Rider said the boy made the threat so he wouldn't have to go to class.

Rider said the call mentioned the massacre at Virginia Tech. A college building was briefly closed, but was reopened after it was searched by bomb-sniffing dogs.