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Students find shade from the hot sun after the threat of an explosive device was received at Deer Valley High School in Antioch, Calif., on Monday, April 22, 2013. At 3 p.m. the campus was cleared by police and students were released. (Jose Carlos Fajardo/Bay Area News Group)

ANTIOCH -- Police have arrested a 16-year-old Deer Valley High student in connection with multiple bomb threats this week at local schools.

Police arrested the boy on the campus Thursday afternoon, saying he is responsible for all seven of the bomb threats this week at Deer Valley High and Black Diamond Middle schools.

Earlier Thursday

, Deer Valley received two additional "vague and anonymous threats" while Black Diamond was the target of a threat before the school day began.

Following up on a lead after the third bomb threat on Thursday, officers and detectives were able to identify and subsequently arrest the teen in connection with the false bomb threats, Capt. Steve McConnell said in a news release.

Some Deer Valley staff and students helped provide important information that led to the arrest, Deer Valley Principal Ken Gardner said in a robocall to parents.

Police said the juvenile later admitted to making the bogus calls.

After news of the arrest, Gardner said, "We're all relieved that this has come to a successful conclusion."

Lyn Ramseier, mother of Deer Valley freshman twins, had kept her children home two days, partly because of allergies from having been out on the fields during the evacuation.

"Each threat made me a little more nervous," she said. "I really believed it was a hoax, but you never know. Now, I can breathe easy and send my kids back to school."

The arrest caps a wild week in which evacuations had become daily occurrences and the patience of parents, teachers and even students wore thin. The false alarms also tied up Antioch's already-limited police resources and jeopardized student learning.

"This is an answer to my prayers. It was upsetting that the children had to be disrupted from their studies so many times," said Carol Hastings, a parent of three, two high-schoolers and one at Black Diamond. "It really hit home when my middle-schooler had an early-morning bomb threat this morning."

She also said as a parent she wants to be notified whenever there is a threat, even if there is no evacuation. "That's absolutely a must."

Nicole Hunt, who works for the district and is a parent of two Deer Valley students, said the frustrating part was that it was apparent early on that the threats were a hoax.

"Thank God that this is all over," Hunt said. "I know that the kids were getting sick of being evacuated every day and wasting time."

It remains to be seen how much the episode will cost the district.

Investigators are still looking into Wednesday's false bomb threat at Antioch High School.

Anyone with tips should call Antioch police Detective Matthew Koch at 925-779-6895. The district and police are also encouraging students or others with information to text a tip to 274637 (CRIMES) using key word ANTIOCH.

Contact Paul Burgarino at 925-779-7164. Follow him at Twitter.com/paulburgarino.