LONDON — A £1 million mural by British street artist Banksy which mocked government surveillance has been destroyed during building works on the house on which it appeared in 2014, the local council said Monday.

The piece, titled Spy Booth, depicted three men in trench coats using listening devices to tap into conversations at an actual public telephone box in Cheltenham, southwest England.

It was located just three miles (five kilometres) from the UK government listening post GCHQ, which was the subject of a series of revelations by fugitive former US intelligence contractor Edward Snowden. The local council said the owner had confirmed the mural was damaged during urgent works on the end-of-terrace home, which was given protected status after the mural appeared overnight in April 2014.

"He was carrying out works to his property following an urgent works notice issued by the council to stop further deterioration of the listed building," said council official Mark Nelson.

"We were aware of loose render on that part of the building where this was situated but the extent and how far it would affect the mural was unknown until work progressed."

A picture on Twitter appeared to show the wall stripped back to the brickwork.

The property owner has made available pieces of the rendering on which the artwork was painted for the council to use in its investigation, said Nelson.

The mural, valued at £1 million (US$1.3 million), had become a tourist attraction but was damaged when fellow graffiti artists spray-painted silver and red on to the elusive artist’s design.

Alex Chalk, the Conservative MP for the town, described the destruction as "shocking news," calling the work an "admired piece of Cheltenham’s artistic heritage".

"We need an urgent inquiry to get to the bottom of what happened. Whoever is responsible needs to be held to account," he said, according to the Press Association.

Banksy is renowned for his street artworks, which often use subversive or satirical imagery to tackle subjects such as war, capitalism, hypocrisy and greed.

He also left an artwork on Israel’s controversial West Bank separation barrier.

The artist’s identity remains shrouded in secrecy but he is believed to have started out as a graffiti artist in the southwestern city of Bristol. — AFP