A four-storey building in Guinea-Bissau has collapsed, killing 11 people including two babies, a hospital source and a local resident told AFP on Tuesday. The accident took place Monday in the town of Canchungo to the north of the impoverished west African country. Rescuers retrieved four bodies from the building on Monday and seven more on Tuesday, the hospital source said. Two babies, aged six and eight months, were among the victims, the source added. Two more people were injured.