Martin Elementary School in Lake in the Hills placed on lockdown Friday morning based on threatening graffiti

A Lake in the Hills elementary school went on lockdown Friday morning after threatening graffiti was found in a student bathroom, a district spokeswoman said.

A message referencing a weapon possibly being on the grounds at Martin Elementary School prompted administrators to put the building on a “hold in place and teach” lockdown about 9:40 a.m., district spokeswoman Alexandra LeMoine said in an email.

School officials worked with Lake in the Hills police, searched the building and determined there was no threat, LeMoine said. The lockdown was lifted just after noon Friday, she said.

Students remained in the classrooms during the investigation, LeMoine said.

The incident followed a similar threat found Thursday in the school, which also prompted the same type of lockdown, she said. That also resulted in a determination that there was no threat, LeMoine said.