BRIMFIELD TWP.: Field Middle School was placed on lockdown Monday morning for about 30 minutes after a threatening word was found written on a girls bathroom wall.

Brimfield Police Chief David Oliver said the building was swept for explosives after the word “bomb” was discovered along with several other words about 7:30 a.m.

Oliver said he believes the word was written before students went on spring break last week.

“It looked to me to be a bit old. I think it was written earlier,” he said.

K-9 officer Nitro cleared the building with the help of officers and school staff.

The school was declared safe shortly after 8 a.m., Oliver said.