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.

Image: Directors Joe and Anthony Russo urged fans to avoid giving away spoilers. Pic: @Russo_Brothers

"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."

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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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The blockbuster will draw the Infinity Saga to its conclusion after 11 years and 22 films.

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.

Even cast members were not privy to some information; Spiderman actor Tom Holland received a script full of fake scenes as he could not be trusted in interviews, according to Robert Downey Jr.

Joe Russo told Games Radar: "We can't trust anybody – least of all Tom Holland – with the truth."

He continued, "It's probably easier to have read a fake script and a fake ending becaRead More – Source

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