Updated at 1:02 p.m. Updated to include comment from a student.

FRISCO — With two days left before summer break, extra security is stationed at Heritage High School as a precaution after rumors have gone viral on social media about a potential threat.

Frisco police spokesman James Willis said Thursday officers are investigating as they do with any threat but believe this to be unfounded rumors.

Heritage High School Principal Mark Mimms said in an email to parents that officials are looking into "rumors that have gone viral on social media," and "should anything come to light, we will handle it swiftly."

The SM threats from HeritageHS are unfounded rumors. We will investigate all threats as a serious matter. FPD encourages parents to talk about reporting any susp behavior or SM activity & that any comments or SM post that could be seen as a threat will be investigated as such. — Frisco Police (@FriscoPD) May 31, 2018

Classes are operating as scheduled, a district spokeswoman said. Heritage students and staff have a full day of class on Thursday and a half day on Friday remaining in the school year.

Frisco police said officers also investigated a potential threat at Reedy High School on Thursday. Investigators determined it was an unfounded rumor.

Mimms' email states that the school district has a strong relationship with Frisco police, and administrators are working closely with the department.

"Frisco ISD and HHS take all matters and concerns seriously when the safety of our students may be at risk," he stated. "If we had felt at any time that your students or our staff were in danger, we would have notified you immediately. We would never knowingly compromise their safety or the security of our campus."

At least five teens have been arrested this school year in connection with threats at Frisco ISD campuses. Most recently, two 14-year-old Frisco ISD students were taken into custody on Tuesday on suspicion of making threats at Stafford Middle School.

There has been a heightened awareness nationwide about school safety after multiple threats and several mass shootings, the most recent one leaving 10 people dead May 18 at Santa Fe High School near Houston.

In April, tens of thousands of students across the country participated in the National School Walkout against gun violence. Frisco ISD students from all nine of the district's high schools as well as some of its middle schools were among those joining in.

One of the student organizers was Heritage High School senior Ryan Short.

"Instead of being able to enjoy the end of the year, Frisco students have to worry about whether they'll be the next statistic," he posted on Twitter on Thursday. "This is our new normal."

Willis, the Frisco PD spokesman, reminds parents to caution their kids about making comments on social media that could be viewed as a threat.

"That's how it will be investigated," he said.

Officials are also stressing to people that if they see something, say something. Anyone with information about a potential threat or suspicious behavior is asked to call Frisco police at 972-292-6010. People can also send an anonymous tip by texting FRISCOPD and the tip to 847411 (tip411) or by downloading the Frisco PD app available on Android and iOS devices.

"We're trying to remind parents to talk to their kids about reporting any suspicious behavior or social media activity," Willis said.

Frisco ISD also operates an anonymous tip line through a program called Choose to Care. To report a tip, call 877-277-3812 or visit www.choosetocare.com/EnterCall.cfm.

To all of our social media followers we are aware of the potential threat to Heritage High School. We are currently investigating the threat and taking appropriate actions to keep our schools safe.#SeeSomethingSaySomething — Frisco Police (@FriscoPD) May 31, 2018