Armed police cordon off Monthermer Road in Cardiff
An operation involving armed police has been carried out at an address in Cardiff.
South Wales Police cordoned off an area surrounding a property in Monthermer Road, Cathays, at 08:27 BST on Saturday.
It is understood the street has now been reopened and the incident is being investigated.
Insp Chris Truscott could not confirm if there were firearms or other weapons inside the property.
It is not known how many people at the address were involved.
Insp Truscott said officers were deployed for "the safety of the public and the police officers".
The police helicopter was also at the scene.
Insp Truscott said: "South Wales Police officers have attended the scene of an incident at Monthermer Road, Cardiff.
"An investigation into the matter is continuing.
"Armed police officers were deployed to ensure the safety of the public and officers in the area."
South Wales Police later confirmed that an officer sustained minor injuries to his arms during the incident.