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Oregon bomb investigators look for sports car seen speeding from neighborhood of blast

  • Officials work at the scene near the Jackson County District Attorney's office after an explosion shattered windows and damaged the buildings interior Wednesday, Nov. 13, 2013, in Medford, Ore. Officers say they found a burning propane tank in front of the prosecutor's office after an explosion they believe was an attempt to level the building. Medford police spokesman Lt. Mike Budreau says the explosion damaged mostly the exterior, shattering windows, but the tank didn't fully detonate.    (AP Photo/The Medford Mail Tribune, Jamie Lusch)

    Officials work at the scene near the Jackson County District Attorney's office after an explosion shattered windows and damaged the buildings interior Wednesday, Nov. 13, 2013, in Medford, Ore. Officers say they found a burning propane tank in front of the prosecutor's office after an explosion they believe was an attempt to level the building. Medford police spokesman Lt. Mike Budreau says the explosion damaged mostly the exterior, shattering windows, but the tank didn't fully detonate. (AP Photo/The Medford Mail Tribune, Jamie Lusch)  (The Associated Press)

  • Medford Police Chief Tim George and Jackson County District Attorney Beth Heckert brief the press Wednesday, Nov. 13, 2013, on an improvised explosive device that blew out windows at the DA's office in a predawn blast. No one was injured. Police said the device would have destroyed the building if it had fully detonated, but a 5-gallon propane tank that was part of it did not go off. (AP Photo/Jeff Barnard)

    Medford Police Chief Tim George and Jackson County District Attorney Beth Heckert brief the press Wednesday, Nov. 13, 2013, on an improvised explosive device that blew out windows at the DA's office in a predawn blast. No one was injured. Police said the device would have destroyed the building if it had fully detonated, but a 5-gallon propane tank that was part of it did not go off. (AP Photo/Jeff Barnard)  (The Associated Press)

  • A police officer examines a propane tank that failed to explode Wednesday Nov. 13, 2013, when an improvised explosive device went off before dawn at the entrance to the Jackson County District Attorney's Office in Medford, Ore. Medford Police Chief Tim George called it an act of domestic terrorism, but the FBI reserved judgment. (AP Photo/Jeff Barnard)

    A police officer examines a propane tank that failed to explode Wednesday Nov. 13, 2013, when an improvised explosive device went off before dawn at the entrance to the Jackson County District Attorney's Office in Medford, Ore. Medford Police Chief Tim George called it an act of domestic terrorism, but the FBI reserved judgment. (AP Photo/Jeff Barnard)  (The Associated Press)

Police investigating an explosion outside a prosecutor's office in Southern Oregon are looking for a sports car seen speeding from the area just after the blast. It's described as a dark, two-door convertible.

Medford Police Chief Tim George said Thursday a person who lives near the Jackson County district attorney's office was outside about 4:30 a.m. Wednesday, heard the blast and then saw the car go by.

George says investigators don't know whether the car is connected to the improvised explosive device, but they want to talk to the driver.

Investigators say they are still looking for two people seen running from the area. One was reported carrying a flashlight.

The explosive partially detonated early Wednesday, blowing out windows, but doing no serious damage.