A teenager has been arrested following "threats involving a firearm" in the same Welsh town where hours earlier two teachers and a student were stabbed by a schoolgirl.

Dyfed-Powys Police said a warrant was executed at an address in Ammanford, Carmarthenshire, overnight and that officers had recovered a BB gun.

A police spokesman 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.”