As both drivers battled for position Leclerc tried to pass Vettel and when both cars came to the straight, the slightest of contacts between them led to two serious punctures which forced firstly Leclerc, then Vettel, out of the race.
Vettel was fuming with the incident, screaming down team radio asking of Leclerc 'what was he doing!', but it appeared that the German had nudged just slightly into his team-mate's path.
But it was unfortunate for both drivers who were trying to race, as the touch between tyres led to more damage than either could ever have imagined.
Here's the incident - who do you think is at fault?
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.