1:40p UPDATE: Arlington PD says suspect 18 year old Timothy Simpkins is in custody after turning himself in to police.  Investigators say a weapon, 45 cal handgun, was recovered.

11a UPDATE: From Arlington PD – All Parents –@mansfieldisd is setting up a parent reunification point at the Center for Performing Arts located at 1110 W. Debbie. Officers will be at that scene. Students will eventually be bused to that location after the school is completely secured.

#BREAKING – Police are investigating reports of an Active Shooter on scene at Mansfield Timberview High School.  Reports of multiple victims, campus is on lockdown.