Argentina says it may have received signals from missing sub

- Argentina's Navy detected seven brief satellite calls late 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. "The calls of a short duration, between 4 and 36 seconds, were received between 10:52 and 10:42 on Saturday at different bases."

Argentina's military clarified that it has not been confirmed the calls came from the submarine, though that is the working hypothesis.

Earlier Saturday, Navy spokesman Enrique Balbi said the area being searched off the country's southern Atlantic coast has been doubled as concerns about the crew's fate grew.

"We are not discounting any hypothesis," Balbi said. Possibilities could include "a problem with communications" or with its power system, he said.

Authorities last had contact with the German-built diesel-electric sub, the ARA San Juan, on Wednesday as it was on a voyage from the extreme southern port of Ushuaia to Mar del Plata.

President Mauricio Macri said in a tweet that the country will use "all resources national and international that are necessary to find the submarine."

Pledges of help came from Chile, Uruguay, Peru and Brazil, as well as the United States, which sent a NASA scientific aircraft and a Navy plane. Britain was sending a polar exploration vessel, the HMS Protector, which British officials said should arrive Sunday.

The U.S. Navy ordered its Undersea Rescue Command based in San Diego, California to deploy to Argentina to support the search for the submarine.

Admiral Gabriel Gonzalez, chief of the Mar del Plata Naval Base, said authorities have reinforced both the surface search for the missing submarine and the underwater search. 

There is "coordination with units from the United Kingdom and the United States," he said. Britain and Argentina fought a war in 1982 over the Falklands Islands, which are called the Malvinas in Argentina. 

Relatives of the crew members gathered at the Mar del Plata Naval Base in the hopes of hearing news about their loved ones. 

"We feel anguish. We are reserved but will not lose our hope that they will return," Marcela Moyano, wife of machinist Hernan Rodriguez, told television network TN. 

From the Vatican, Argentine Pope Francis said he was making "fervent prayers" for the crew.

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