This is a breaking news story. Check back for updates.

UPDATE 1:37 p.m. EST: Officials are now saying two people were killed in the stadium collapse, not three as originally reported.

UPDATE 12:51 p.m. EST: FIFA has put out an official statement on collapse of Itaquerao Stadium, also known as Corinthians Arena:

"FIFA and the [World Cup Local Organizing Committee] have learned of the death of workers at the Corinthians Arena site in Sao Paulo with great sadness. We wish to send our heartfelt condolences to the family of the workers who tragically died today," the statement said. "The safety of workers is the top priority for FIFA, the LOC and the federal government. We know the safety of all workers has always been paramount for all the construction companies contracted to build the 12 FIFA World Cup stadiums. The Department of Labor and the local authorities will fully investigate the reasons behind such a tragic accident. Please understand that we are in no position to comment further at this stage, as we are awaiting further details from the authorities."

Original story:

At least three people were killed after the Itaquerao Stadium – which was set to host the opening match of the 2014 FIFA World Cup in Brazil – collapsed Wednesday.

The Sao Paulo stadium was 94 percent complete when a crane collapse damaged it, the Associated Press reported. The news wire service, citing local media, said three people were killed in the collapse.

FIFA set a Dec. 12 deadline for all 12 of the 2014 World Cup stadiums to complete construction in Brazil. Wednesday's accident may mean Itaquero Stadium won't be complete by that date.