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BALTIMORE (AP) _ State officials closed all major roads into the city Wednesday after a freight train carrying hazardous materials derailed in a downtown tunnel and caught fire.

Civil defense sirens blared across the city as scores of firefighters donned oxygen masks to enter the tunnel, where the CSX freight train with eight cars loaded with hazardous chemicals left the tracks.

Six hours after the 60-car train derailed, state highway officials closed roads into the city at the request of fire and police authorities, said Laura Rakowski, spokeswoman for the State Highway Administration.

``The main effort is to close every road into the city and to close off the city and to encourage motorists not to drive inside the city boundaries,'' Rakowski said.