DERNA: Libyan authorities have opened an investigation into the collapse of two dams that caused a devastating flood in a coastal city as rescue teams searched for bodies on Saturday, nearly a week after the deluge killed more than 11,000 people.Heavy rains caused by Mediterranean storm Daniel caused deadly flooding across eastern Libya last weekend.The floods overwhelmed two dams, sending a wall of water several metres (yards) high through the centre of Derna, destroying entire neighbourhoods and sweeping people out to sea.More than 10,000 are missing, according to...