Houston Independent School District officials are addressing safety concerns following multiple lockdowns at Houston area schools this week, implementing increased security measures and cracking down on threats.

HISD is moving toward a new policy to keep students from using phones during emergencies because they could be “counterproductive” and inhibit first responders.

A student was stabbed by another at Sterling High School in Houston; the suspect is detained and the victim hospitalized.

The district is working on a policy that would prevent students from accessing their cell phones during emergencies, in the interest of safety, after a recent string of unsubstantiated threats of violence as well as incidents involving weapons.