Deadpool trailer at Comic-Con shows Vancouver's Georgia Viaduct

An unofficial trailer for the forthcoming Marvel superhero movie Deadpool was screened at this weekend's Comic-Con in San Diego.

The unreleased trailer, missing the final visual fx, was caught by a conference attendee on their phone, after the movie's Vancouver-born star, Ryan Reynolds grabbed the mic and said, "Let's run it again.'

After the footage made its way to the internet, Reynolds tweeted that fans would have to wait three weeks for the finished trailer to be released.

Despite the poor quality video, it is possible to make out the Vancouver skyline as well as shots of a massive car pile up staged on the city's Georgia Viaduct, which was closed for the production for several days.

The shoot was the subject of huge local interest, with even Mayor Gregor Robertson showing up to have his picture snapped on set.

• Watch the full footage of the unofficial trailer.