Argentina says it may have received signals from missing sub

BUENOS AIRES, Argentina — Argentina's Navy detected seven brief satellite calls Saturday that officials believe may have come from a submarine with 44 crew members that hadn't been heard from in three days.The communication attempts "indicate that the crew is trying to re-establish contact, so we are working to locate the source of the emissions," the Navy said on its Twitter account, adding that the calls lasted between four and 36 seconds.Argentine authorities clarified that it has not b