 The outdoor warning system sirens have been activated due to a severe weather or man-made event. The Fort Worth Office of Emergency Management recommends residents seek shelter inside a sturdy structure and seek additional information about the event. Turn on a local AM radio station such as WBAP AM820, a NOAA weather radio, a local television station, or check your nixle.com messages on your cell phone to gather information. Under a shelter-in-place order, residents would be instructed to stay inside a structure and not venture outdoors. Official instructions may be given to shut off interior air circulation, place towels under doors, seal door and window frames with plastic sheeting and tape, and cover ventilation vents to keep toxic gases outside. Continue to monitor news about the situation and follow instructions from local authorities.