By Emily Mee, news reporter
The directors of Avengers: Endgame have urged fans not to give away spoilers after leaked footage made its way around the internet.
The spoiler-heavy sizzle reel, which was filmed on a mobile phone, caused fans to flee social media and the hashtag #DontSpoilTheEndgame to trend.
Brothers Joe and Anthony Russo wrote an open letter to Marvel fans ahead of the film's release on 25 April, saying they have "worked tirelessly" on the franchise's conclusion.
They wrote: "Because so many of you have invested your time, your hearts and your souls into these stories, we're once again asking for your help.
"When you see Endgame in the coming weeks, please don't spoil it for others, the same way you wouldn't want it spoiled for you."
Referring to one of the film's key characters, they added: "Remember, Thanos still demands your silence."
The leaked scenes briefly appeared on Reddit, YouTube and other platforms, before being removed.
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Details on Disney's forthcoming Avengers: Endgame have been hazy so far, with trailers for the film giving little away and journalists barred from seeing the film before its release.
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