An artwork of swimming fish painted on to a City of London Police sentry box has led to speculation it may be the latest in a new series of works from the artist Banksy.
The glass-fronted box on Ludgate Hill has been transformed to look like an aquarium.
The elusive street artist from Bristol has not yet confirmed he is behind the creation, but if he does, it would be his seventh new artwork to be revealed in the capital in as many days.
Since Monday, stencilled silhouette images of a goat, elephants, monkeys, a wolf, pelicans and a cat have popped up in various locations across London.