The shutdown around First and Second avenues between Marion and Madison Streets began at about 10:40 a.m. Saturday. Police announced the all-clear just before 1:15 p.m.

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A man assaulted security personnel Saturday at the Henry M. Jackson Federal Building on First Avenue in Seattle on Saturday morning while trying to enter the building, police said. As he was being arrested, police said, the man told officers he had left his car in the middle of First Avenue, with explosives in the trunk.

The man appeared to be highly agitated and in crisis, police said witnesses told them. Security employees pepper-sprayed and detained him until police took the 58-year-old into custody, Seattle police reported in a news release.

Officers blocked off First Avenue during the incident and bomb detectives and explosive-detection dogs checked the man’s car. Commercial-grade fireworks were in the trunk. Police collected the fireworks and had the vehicle towed, according to the department.

The shutdown around First and Second avenues between Marion and Madison Streets began at about 10:40 a.m. Police announced the all-clear just before 1:15 p.m., saying the silver sedan had been checked and towed and streets reopened.

The suspect, who has not been identified, was booked into the King County Jail on investigation of assault.