Sandy Hook Elementary School was evacuated due to a bomb threat Friday morning — on the sixth anniversary of the mass shooting at the Newtown, Connecticut, school.

The threat came in around 9 a.m., WFSB TV reports. Police don’t consider it credible, but still dismissed all of the students for the day.

It was not related to online bomb threats that flooded inboxes across the country on Thursday, police told the news outlet.

On Dec. 14, 2012, 20-year-old Adam Lanza fatally shot his mother and then stormed the school, killing 20 young children and six teachers — before killing himself.