According to Marvel Studios, Downey injured his ankle while performing a stunt. The injury will create a "short delay" in the production schedule while he recuperates, according to HitFix, an online entertainment news source.
The film created a stir in the Triangle in June when crews arrived to shoot scenes at Epic Games studios in Cary.
EUE/Screen Gems Studios in Wilmington is serving as the base for the high-profile movie, but it's also being shot at locations in the Raleigh area, Miami and China.
"Iron Man 3" will be shot over the next 8 months and will be released in 2013. State government officials expect that its production will create about 1,550 jobs and generate more than $80 million for North Carolina.
The movie was drawn to North Carolina, in part, by a 25 percent tax credit for production companies spending a minimum of $250,000 that the state has offered since 2010.