Sunday marks the 15th anniversary of the Sept. 11 attacks that left nearly 3,000 people dead and 6,000 more injured.
Social media users took to Reddit, Twitter and Facebook to react to the photo, many calling the costume choice "horrible" and "distasteful."
Dragon Con officials released a statement to The Atlanta Journal-Constitution about the costume controversy, claiming they did not believe the cosplayers were members of the convention.
Read the full statement below:
"We share the concerns of everyone who was upset by these costumes. Their costumes were offensive, distasteful, and completely inappropriate.
"We became aware of these individuals in the evening and dispatched both Dragon Con and hotel security to find them, pull their badges, and escort them from the property for violating convention policies. They had apparently left the Dragon Con convention area shortly after the photographs were taken.
"Based on other photographs we have seen, we do not believe that these individuals were members of Dragon Con, meaning that they had not purchased badges that would have allowed them to enter the convention."
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