Argentine navy says explosion heard in search area of missing submarine

Relatives of the crew members of Argentine missing submarine ARA San Juan react outside the Mar del Plata Navy Base, in Mar del Plata, Argentina, on Nov. 23, 2017. Argentina's Navy confirmed on Thursday that there was a "singular, abnormal, short, violent and non-nuclear event" consistent with an explosion in the area where the submarine was lost. (Xinhua/Martin Zabala)