By Emile Picy VERSAILLES, France (Reuters) - French President Francois Hollande appealed on Monday for a single coalition including the United States and Russia to eradicate Islamic State militants in Syria after bloody attacks on Paris. In a solemn address to a joint session of parliament in the Palace of Versailles that began with the words "France is at war", Hollande announced an increase in police recruitment, a halt to layoffs in the army, and a constitutional amendment to strengthen the fight against terrorism. The attacks by gunmen and suicide bombers at restaurants, bars, a soccer stadium and a music hall that killed 129 people and wounded more than 350 people were ordered from Syria, planned in Belgium and carried out with the help of French people, he said.