KIRKLAND, Wash. — A student at Juanita High School has been arrested for posting threats against his classmates.

Despite the arrest, the school was closed on Monday as a precaution.

Kirkland Police said they received multiple reports of threats of online violence Sunday afternoon, including a photo of a gun.

The threats, which were also reported to the Lake Washington School District (LWSD), were allegedly carried out at the high school this week, according to police.

Police said they arrested the suspect, an 18-year-old senior at the school, without incident.

The teenager was incarcerated in Kirkland prison for several counts of harassment. He is barred from all property owned by LWSD and his parents have stated that he will not have access to any firearms.

The district sent a letter to the families that said in part, “We greatly appreciate the students and community members who have provided information related to threats of violence.

He goes on to say that LWSD is actively monitoring its whistleblower line and that collaboration with Kirkland Police will continue.

The district plans to have additional patrols on school campuses this week.

The arrest comes amid a period of high tension and concern, following a number of mass shootings, including one at an elementary school in Texas, which left 19 students dead and two adults.

On June 4, Tacoma police reported on June 4 that they had made five arrests since May for students who brought firearms to campus. At Blaine, classes were canceled several days after a number of threats that the student later said were a prank.

Parents are encouraged to talk to their children about what to do if they feel unsafe at school or to call 911 if they hear of threats or see a weapon.