A sculpture by artist Barbara Hepworth has been ripped from its plinth in a public park in the latest of a spate of metal thefts.

The bronze work of art, called Two Forms (Divided Circle), was stolen overnight on Monday from Dulwich Park in Southwark, south London.

Council staff discovered the theft this morning after the park was unlocked and town hall bosses have offered a �1,000 reward for information leading to the arrest and conviction of the thieves.