A warrant was executed at an address in Ammanford, Carmarthenshire last night

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.

Superintendent Ross Evans later said: “We would like to thank the many members of the public who reported concerns around messages they had seen online. This allowed us to take swift action in executing a warrant and arresting a suspect.

“While this investigation is being run separately to our enquiries into the major incident at Ysgol Dyffryn Amman yesterday, our officers will be seeking to establish both the credibility of the threats, and whether there was any connection between the alleged offences.

“Again, I would urge people not to speculate, not to share any images or videos relating to either investigation, and to allow us to carry out our enquiries fully.

“If you, or your children, are distressed by these events, please seek support from an appropriate agency.”

The force said in a statement: "One person has been arrested and we are not looking for anyone else in connection with this incident."

Two teachers and a pupil have since been identified as victims, whilst another teacher has been applauded for his efforts to disarm the Year 9 pupil.

Drama and Welsh teacher Fiona Elias, and Liz Hopkin, who works with special needs students, are both “lucky to be alive” according to colleagues.

A source told the Daily Mail: “The teacher targeted in the attack is lucky to be alive. She was stabbed in the neck, it was incredibly serious, but we have been told she will recover.

“A second teacher was also stabbed and a pupil who tried to intervene was stabbed.”

During the chaos, fellow teacher Darrell Campbell managed to disarm the girl by “wrestling the knife” out of her grip. He kept her in an armlock until emergency services arrived on the scene and was not harmed whilst subduing the teenager.

Amman Valley School posted on its website: “You will be aware of the incident that has taken place at Ysgol Dyffryn Aman today.

“The family members of all injured persons have been informed. We would like to reassure parents and the public that the incident has been contained.”