LONDON : Tesco, the world’s No. 3 retailer, has stopped sourcing clothes from a factory in Bangladesh after discovering serious problems with the safety of a building, the company said on Saturday. The move follows a survey the British-based supermarket chain conducted in the wake of the collapse of the Rana Plaza factory complex in Dhaka in April that killed 1,129 people. “A structural survey of a site we source from in Bangladesh, owned by Liberty Fashions, has revealed serious problems with the safety of one of the buildings,” Tesco said.