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Portland police are investigating a potential explosive device on Southeast Flavel Drive near 45th Avenue.

(Drew Vattiat/The Oregonian)

Portland police are investigating a potential explosive device tossed from a vehicle on Southeast Flavel Drive near the 45th Avenue intersection, officials said.

Officers attempted to stop a two-door silver Honda Civic on Flavel Drive, but the driver sped away from police, said Sgt. Pete Simpson, a Portland Police Bureau spokesman.

Officers discontinued their pursuit when an item was tossed from the vehicle and left in the roadway. The item did not detonate, Simpson said.

Police are evacuating some people from the neighborhood.

Flavel Driver is blocked from 45th to 52nd Avenue.