Armed police conducted armed raids on several properties in Dewsbury and its surrounding areas on Saturday.
Witnesses on Chickenley Lane reported a strong police presence and forced entry into a property at around 3am.
A West Yorkshire Police spokesperson said: "Officers were conducting arrest warrants in the Dewsbury area in the early hours of Saturday morning (13 October).
"A 37-year-old man was arrested on suspicion of possession of a firearm at an address in Tingley.
"Police cordons remained in place at properties in Dewsbury while they were searched by police officers."