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Superhero action flick Avengers Assemble is yet to finish filming - despite it due to be released in the next few weeks.

Robert Downey Jr. who plays Iron Man let slip the news during a press conference that they still needed to film a scene later that night.

Director Joss Whedon attempted to play down the claims but Mark Ruffalo also confirmed the news in an interview with 'The Playlist' "We're shooting a scene tonight. I'm not sure exactly where it's gonna go. All I know is that someone came in with the costume and said, 'Here's some wardrobe. We don't know where you're going to be or what you're doing.' So I'm like, 'All right, when are we doing that?' 'Today after we're done.'"

Avengers Assemble is set for realese in the UK on 26 April after a name change from the original title of simply, The Avengers.