Hours after the SeaTac assault and robbery, three men were arrested in Chehalis.

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Authorities have arrested three men who investigators say attacked a jewelry courier at a SeaTac motel Monday evening and stole nearly $500,000 worth of gems.

According to King County sheriff’s Sgt. Cindi West, the courier was walking to his room at the hotel in the 20400 block of International Boulevard around 6 p.m. when the robbers approached him wearing masks.

The men assaulted the courier, took his bag containing jewelry and slashed a tire on his vehicle before getting into another vehicle and driving away, West said in a news release.

About two hours later, a Washington State Patrol trooper spotted the suspect vehicle at a Chehalis gas station, the release says.

Law-enforcement officers arrested three men and took them to King County, where West said authorities will book them on suspicion of robbery.

On Tuesday, investigators are expected to get a search warrant to recover the jewelry, which they believe is in the suspect vehicle, according to the release.

In October, a group of robbers boxed in a diamond couriers’ car on an Interstate 5 onramp, held the driver at gunpoint and stole $400,000 worth of gems in SeaTac. The two victims, were couriers in town from Hong Kong to sell the cache of diamonds, according to the  sheriff’s office.