WASHINGTON — The U.S. Secret Service says authorities have responded to a fire and are searching a vehicle near the White House.

The fire briefly delayed the departure of President Barack Obama and the first family Saturday morning. They were heading to Selma, Alabama, for a historic 50th anniversary march. Reporters at the scene heard a loud noise before they were led back inside.

Secret Service spokesman Brian Leary says a vendor cart caught fire around 10 a.m. at 15th and G streets. Firefighters responded and contained the blaze. D.C. Fire and EMS says one patient was evaluated but wasn’t taken to a hospital.

Around the same time, Leary says a bomb-sniffing dog detected something on a vehicle nearby. Nothing dangerous was found and the vehicle was declared safe shortly before noon.