Argentina says a sound detected in the missing submarine search is consistent with an explosion.

The noise was observed around the time the ARA San Juan submarine sent its last signal last week.

Navy spokesman Enrique Balbi described the blast in the morning of 15 November as “abnormal, singular, short, violent” and “non-nuclear.”

It was “consistent with an explosion”, he added. Argentina says there is no evidence of an attack on the craft.

A huge sea and air hunt is being conducted for the craft, which went missing with 44 crew on board.