Marysville police have arrested two men after an elementary school was shot up with dozens of bullet holes over the holiday weekend.

Over New Year's Eve, Pinewood Elementary was shot over 60 times, causing an estimated $35,000-$50,000 in damage.

After receiving a tip, police arrested a 19-year-old Marysville resident and an 18-year-old Tulalip resident, who is a Marysville School District student. Both were taken into custody without incident and will be booked into the Snohomish County Jail on Class B felony charges of Malicious Mischief in the First Degree.

Students had returned to Pinewood Elementary School from their holiday break greeted by hand-painted banners reading, "We Love Pinewood."

Those posters, however, were covering up bullet holes -- dozens of them -- fired directly into classrooms. The library was hit especially hard.

The news was chilling to parent Donnie Whittle.

"It hurts my heart," said the father of a first-grade boy. "I don't know why someone would do this. It's just hateful and unnecessary."

Investigators said it appears whoever committed the crime timed it right around midnight on New Year's Eve so neighbors would think the gunfire was actually fireworks.

"The level of violence is completely off the charts," said Marysville Police Commander Mark Thomas. "We haven't had a situation like this where so much damage was done with a firearm in recent memory."

In a letter to parents, school officials called the damage "extensive." Estimates put the dollar amount as high as $50,000.

Police labeled the incident an act of vandalism, nothing more, and they don't think any of the school's 600 students are at risk.

Patrols around Pinewood were increased with police visible for much of the day Wednesday.

While he called the situation an "isolated incident," Commander Thomas said parents should remain vigilant.

"To shoot randomly like that is frightening to us in terms of the mentality and the mindset of somebody who would do that," Thomas said.

School officials said they are looking into security upgrades for the 50-year-old campus, as parents started the new year with all too familiar concerns.

"Once again we have to worry about bullets being shot off at a school," said Whittle. "It's just wrong."

Police offered a $1,000 reward for information leading to an arrest in this case. Contact Marysville Police or Crime Stoppers at 800-222-TIPS. You can remain anonymous and still receive the reward.