abc action reporter kera mashek is at a school possibly being targeted because of its name. >> reporter: the online message was for someone to bring a gun in a backpack and go in the school and start shooting. it is likely this is one hoax but school officials here were not taking any chances. extra police officers set up shot at lincoln middle school in palmetto wednesday and kids asked to leave backpacks at home after this online threat made its way to district administrators. >> we're always going to err on the side of safety. lawsuit to, you know, help determine, you know, the source and the credibility of the threat. >> reporter: some nervous parents still kept their kids home. >> it's scary because things do actually happen. and it's something that you don't want to have to be worried about for your kids. >> reporter: it turns out this exact same message was blasted out to people affiliated with lincoln schools all over the country. tracking down where and how it started is still being investigated. school officials say with a heightened sensitivity to mass shootings, even if a th