LOS ANGELES — San Francisco 49ers linebacker Aldon Smith was arrested Sunday at Los Angeles International Airport after authorities said he became belligerent during a security screening and threatened that he had a bomb.

The 24-year-old player was randomly selected for a secondary screening at Terminal 1 and became uncooperative with the process, airport police Sgt. Karla Ortiz said. She said he told a TSA agent he had a bomb before walking to the gate. When airport police officers caught up with him, Ortiz said Smith became uncooperative and was taken into custody.

A witness video posted on TMZ.com shows Smith exchanging words with an officer as he was being handcuffed and escorted out of the gate area.

With the arrest, Smith is involved in three pending criminal cases.

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“We are disappointed to learn of the incident today involving Aldon Smith,” 49ers general manager Trent Baalke said in a statement.

A fearsome pass-rushing specialist, Smith took a five-game leave of absence from the 49ers last season to undergo treatment for substance abuse.

He was arrested Sept. 20 and jailed on suspicion of DUI and marijuana possession.

In November, Smith pleaded not guilty to three felony counts of illegal possession of an assault weapon, stemming from a June 2012 party at his home.