martinsville elementary and junior senior high schools said dismissal was delayed "due to a safety concern." the clark county sheriff's office said it came after police received information that put them on high-alert. they have not said what caused the alert. officers walked the wooded areas near the schools to clear any potential issues. they also used a drone for over the area to monitor the threat.. and keep officers safe. the drone was still in place while parents picked up their kids from school.