A Lanham man is being held without bond after Hyattsville police seized about 58 pounds of marijuana worth about $527,000 and three loaded handguns at his business.

Dean Roy Thomas was arrested Nov. 2 after officers responded to the Melrose Industrial Park in the 4800 block of Rhode Island Avenue on the report of a first-degree assault.

The assault victim, who was not identified, reportedly told police that the suspect was a local business owner.

Police established a perimeter around the building and ordered everyone inside to get out. A Metro Transit K9 unit was called. A search of the building revealed the marijuana and the handguns.

Thomas has been charged with first-degree assault and numerous drug and weapons charges, police said Wednesday. The investigation is ongoing.