A fourth Banksy artwork revealed in London in as many days appears to have been stolen.
On Thursday, the Bristol-based street artist posted an image on Instagram of the silhouette of a wolf howling at the moon on a satellite dish in Rye Lane, Peckham, south London.
The Banksy press team confirmed to the BBC they "believed" it had been stolen.
It comes after Banksy also claimed credit for three other black silhouette compositions, which appeared in London earlier this week and are part of an animal-themed series.
Banksy unveiled his third piece on Wednesday, which depicts three monkeys seemingly swinging on a railway bridge in Brick Lane, east London.
The BBC understands the art series is set to conclude at the end of this week.
There has been considerable speculation as to what the pieces may mean, but Banksy's representatives have so far declined to comment on any theories.