Kapoor dedicates art to detained artist Ai Weiwei

Sculptor Anish Kapoor has condemned China's detention of artist Ai Weiwei and has called on galleries to close for a day in protest.

Ai, an outspoken critic of China's human rights record, has not been heard from since he was arrested in Beijing at the start of April.

Kapoor has dedicated his monumental Leviathan art installation in Paris to Ai as two major exhibitions of Ai's work open in London this week.

He said it was important artists stick together.