Hundreds of migrants in distress off the Canary Islands were rescued in the span of a few hours, Spanish emergency services said on Thursday. The Maritime Safety and Rescue Society said teams worked all night to tend to a total of 516 migrants travelling on five boats, with young children and babies among the passengers. They were mainly from sub-Saharan African countries. The people, some in critical condition, were taken to the Atlantic islands of Tenerife, Gran Canaria and El Hierro. Passengers told the rescuers that 10 to 12 died on one of the boats during the crossing. The bodies were thr…