Rebecca Adlington has paid tribute to Olympic Champion Camille Muffat following her death.
Ten people, including Muffat, were killed when two helicopters apparently collided in the Argentine province of La Rioja.
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The country's top defence officer said the force may ignore any order to launch a nuclear attack which is deemed to be illegal.
Navy officials say they have received seven short satellite calls which are though to have come from the submarine.
The President is to meet with with the army commander who put him under arrest as he resists calls for him to stand down.