The boy remains in custody after police recovered a BB gun at an address in the Ammanford area.
A spokesperson for Dyfed Powys Police said: “An arrest has been made in the Ammanford area overnight, following threats involving a firearm.
“A warrant was executed at an address in the area, and police have recovered a BB gun.
“The teenage boy remains in police custody.”
The latest incident comes just hours after a teenage girl was arrested for attempted murder after allegedly injuring two teachers and a teenage girl with a knife at an Ammanford school.
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