Days after police deemed a shooting threat written at Round Rock High School not credible, the principal has sent a letter to the community to inform them of a possible "copycat" threat.

On Dec. 1, Round Rock High School Principal Matt Groff sent a letter saying there was a new threat scrawled in the boys' restroom in the 700 hallway of the school.

"It referenced the date December 13 and bringing a gun to school," the principal said.

The first threat happened on Nov. 14 and, according to officials, the message said the shooting was supposed to take place Nov. 28. An investigation by the district and police found the threat was not credible.


Police: Shooting threat written on Round Rock High School bathroom wall not credible

Groff said the school is working with the Round Rock Police Department to determine whether the new threat is credible.

"Please know that threats made toward campus safety are taken very seriously. We will not tolerate any incident that threatens the security of our students and interrupts the educational process," Groff said. "If you have any questions or concerns, please do not hesitate to call me at 512-464-6000. Thank you for your understanding and support."