Armed police were called to a house in Milford Haven following reports someone was in possession of a knife.
Police arrived at Ash Grove, Mount Estate, shortly after 2am today following a report of a domestic incident.
Firearms officers also went as threats were said to have been made.
When police arrived at the property, they said a man was aggressive to officers.
Officers subsequently Tasered a man and arrested him on suspicion of breach of the peace in connection with the incident
He was taken to hospital as a precaution but was not injured according to a police spokeswoman. A woman was also arrested on suspicion of threatening behaviour.
This is what happens after a crime has been reported:
The spokeswoman for Dyfed-Powys Police said: "Following the arrests, officers commenced a search for a third person, who they believed was injured. He was found at a property in Chestnut Way at around 5am, with minor injuries.
"He was arrested on suspicion of possession of a knife, and taken to hospital. The three arrested people are in police custody.
"Officers will be in the area carrying out house-to-house enquiries and reassurance patrols today."
Anyone with information is asked to either report it to an officer, or to call 101. Alternatively, make an anonymous report to Crimestoppers, by calling 0800 555 111.
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