Fast food chain Burger King is selling itself to private equity firm 3G Capital in a deal valued at $3.26bn (€2.5bn).

Burger King Corp’s franchisees took aim at the fast-food chain’s management, complaining to the restaurant’s board about a series of decisions they say are “ill-conceived” and put the burger joint’s business in “deep trouble”.

Fast food giant Burger King is to revamp its 12,000 restaurants worldwide to give them an upmarket feel, it announced today.

Burger King has today pledged to offer healthier fast-food items for American children under the age of 12, with plans to sell and market apples cut to resemble thick-cut french fries.

BURGER King Holdings, the second-biggest US hamburger chain, posted a fourth-quarter loss on payments related to its initial public offering in May.