WASHINGTON — An investigation into a suspicious vehicle near President-elect Barack Obama's transition team office in northwest Washington shut down streets for about an hour.

Secret Service spokesman Eric Zahren says explosive detection dogs alerted officials to the vehicle around noon Wednesday. He says the vehicle was going through a checkpoint to access the same building that houses Obama's transition team.

Authorities closed about three blocks in downtown Washington while they investigated. Officials eventually determined that the driver was authorized to be in the area and that the vehicle posed no security risk.