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Authorities shut down the parking garage across the street from the Cook County Criminal Courts Building for about a half-hour Wednesday after a law-enforcement officer found two suspicious canisters attached to his vehicle.

The officer was leaving the garage about 1:15 p.m. when he heard a rattling sound coming from his vehicle, Cook County sheriff’s department spokesman Steve Patterson said.

“The officer got out of his vehicle and found two rattling canisters adhered to his car,” Patterson said.

The officer called for help. The investigation into the incident is being handled by members of the Chicago Police Bomb and Arson unit, Patterson said.

The garage was reopened about 1:45 p.m.