An "upset" passenger at the Oakland International Airport was responsible for briefly shutting down Terminal 1 after issuing an unfounded bomb threat on Sunday afternoon, police say.

The man, who was not identified, had apparently told an airline staffer that he had a bomb in his luggage because he was "irate" over a delayed flight, according to the Alameda County Sherriff’s Office.

Terminal 1 was shut down for two hours before a bomb squad determined the threat to be unfounded, police say.

Terminal 1 was shut down for two hours before a bomb squad determined the threat to be unfounded, police say. (Oakland International Airport)

The carrier contacted police, who arrived on scene and arrested the suspect after a "brief struggle."

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"There was really no consoling this individual," Sgt. Ray Kelly of the Alameda County police said, in a statement obtained by Mercury News.

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Terminal 1 was subsequently shut down for two hours while a bomb squad located the man’s luggage and determined the threat to be "unfounded."

A representative for Oakland International Airport did not immediately respond to Fox News' request for further comment.

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Oakland International Airport, meanwhile, had also made headlines last week for becoming the first U.S. airport to begin selling COVID-19 testing kits directly to travelers via vending machines. The machines, located in both of the airport's terminals, offer the at-home RT-PCT testing kits for between $130 and $150.

Oakland International Airport also made headlines last week for becoming the first U.S. airport to begin selling COVID-19 testing kits directly to travelers via vending machines located in both terminals.

Oakland International Airport also made headlines last week for becoming the first U.S. airport to begin selling COVID-19 testing kits directly to travelers via vending machines located in both terminals. (Oakland International Airport)

"As one of the first airports to offer on-site rapid COVID testing, we are now providing even more testing options for travelers," said Bryant L. Francis, Port of Oakland Aviation Director, in a news release. "We still urge travelers to make sure they are current on any quarantines and regulations at their destinations."