By Chine Labbé and Tiemoko Diallo PARIS/BAMAKO (Reuters) - Poor weather was the most likely cause of the crash of an Air Algerie flight in the West African country of Mali that killed all 118 people on board, French officials said on Friday. "French soldiers who are on the ground have started the first investigations," French President Francois Hollande told reporters. An earlier count of 51 French nationals among the dead was also raised to 54 by the French Foreign Ministry to include those with dual nationality. French, Malian and Dutch soldiers from a U.N. peacekeeping force (MINUSMA) secured the crash site, which lies about 80 km (50 miles) south of the northern Malian town of Gossi, near the Burkina Faso border.