9:25 a.m. The box has construction supplies in it, police Master Sgt. Gary Knight reports. The street is being reopened and an all clear given to pedestrians and people inside buildings in the area, Knight says.
9:05 a.m. A blue and white box is on a concrete wall on the northeast corner of of NW 4 and Walker Avenue at the base of a clock tower.
8:45 a.m. A fire department spokesman says there is suspicious package outside in the area. Battalion Chief Brian Stanaland said firefighters are assisting police on the call.
8:35 a.m. People are being urged to stay in their offices or inside buildings. Pedestrians are being kept out of the area, according to police radio reports.
8:30 a.m. A hazardous materials unit has responded to a report of a suspicious substance Thursday morning in downtown Oklahoma City.
Police officers are diverting traffic from NW 4 and Walker Avenue, according to police scanner reports.
An ambulance has been requested at the scene.