Hotel guests were allowed back in their rooms late Thursday night after sheriff's deputies found a military training grenade at the Comfort Inn in Pickerington on State Route 256.
Deputies said the investigation started after a traffic stop earlier Thursday.
That stop yielded information about a drug trafficking ring at the hotel.
Deputies said they found drugs, an A-K 47 and a modified A-K 47 in the car.
They found the grenade and a rifle inside the hotel.
Deputies said several people have been arrested in connection with the raid.
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