Several lanes are closed as police investigate an incident where a truck driver was shot while driving on Interstate 30 in Dallas Monday morning, police say. The driver of the United States Postal Service truck was pronounced dead at the scene, police say. The shooter fled the scene and the interstate will be closed to one lane. Lane closures start from Sylvan Avenue to Commerce Street and Colorado Boulevard exits, police say. Ramps to I-30E and southbound I-35E are closed. No other information was available.