"We're guessing the @BurgerKing social media team is having a bad day..." tweeted @YourAnonNews, one of Anonymous' most active Twitter accounts.
The hacked account did not mention anything about the horse meat scandal, though it did tweet out a gross-looking photo of a burger, saying "This is why we were sold to @McDonalds."
On Jan 31, Burger King announced that it had terminated its relationship with supplier Silvercrest Foods after finding traces of horse meat in beef patties at a Silvercrest facility.
Silvercrest provided beef for Burger King restaurants in the United Kingdom, Ireland and Denmark. Burger King said that while samples of beef from restaurants in these countries showed no evidence of contamination, four samples from a Silvercrest plant in Ireland showed "very small trace levels of equine DNA."
Burger King said the tainted product was never sold in restaurants, and appeared to have originated from a sub-contracted supplier in Poland.