LONDON — A second suspect was arrested in the alleged theft of a work by the elusive street artist Banksy of a stop sign adorned with three military drones, London police said Sunday.

       A man in his 40s was in custody on suspicion of theft and criminal damage, the Metropolitan police said. A suspect in his 20s who was arrested Saturday was released on bail.

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       Witnesses who arrived at a street corner Friday in the south London section of Peckham less than an hour after Banksy posted a photo of the work on Instagram said they were stunned to watch a man with bolt cutters remove the sign as another man steadied a bike he stood on.

       The incident was captured in photos and video.

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       Much of Banksy’s political and satirical art is critical of war, and many of his followers interpreted the work as calling for a cease-fire in the Gaza Strip.