Swansea mystery siren triggers investigation

Image caption, The council has confirmed it is investigating the source of the noise

A mystery siren-like noise which is keeping Swansea residents awake at night has triggered an investigation by the council.

Swansea council said it was contacted by after readers reported the problem in Townhill and Mayhill to the paper.

A council spokesman said a potential source of the sound had been located.

Members of the public were asked to contact the local authority's noise pollution team with information.