For decades, people have been trying to find out the true identity of Banksy, the British graffiti artist. Now, an investigation suggests that he may be Robert Del Naja, better known as 3D of Massive Attack.

According to the Daily Mail, an investigative journalist named Craig Williams noticed that Banksy’s work has often popped up in cities where Massive Attack are performing. He pointed to murals found in Melbourne, Australia, in 2003 and several North American cities in 2010. In addition, a 2006 exhibition of Banksy’s work in Los Angeles took place shortly after Massive Attack played the Hollywood Bowl, and the band’s 2013 New York dates were matched with his month-long residency there. While those could seem like nothing more coincidences, Del Naja was a graffiti artist in the ‘80s, and he claims to be friends with Banksy.

Williams also has another theory, that there is more than one Banksy, and Del Naja is part of the collective. “Perhaps the assertion then that Banksy is just one person is wide of the mark,” he suggested, “instead being a group who have, over the years, followed Massive Attack around and painted walls at their leisure. And perhaps, at the head of such a group we have Del Naja. A multi-disciplined artist in front of one the seminal groups in recent British music history, doubling up as the planet's most revered street artist. Now that would be cool.”

Del Naja has denied being Banksy, saying that he gave up graffiti in 1986 after his second arrest. It is widely believed that Banksy is actually a man from Bristol, Massive Attack’s hometown, named Robin Gunningham.

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