US President Barack Obama said his alliance partners would deploy about 5,000 troops and trainers "to advance [Washington's] new strategy".The Nato 60th anniversary summit in Strasbourg picked Danish PM Anders Fogh Rasmussen as new secretary-general.Anti-Nato protesters fought police and set buildings alight in the city.They set a hotel and a customs house on fire and three columns of smoke could be seen rising over the Europe Bridge area of the French city, across from the small town of Kehl in Germany, where part of the summit was held.At least 25 people were arrested, adding to dozens detained in the run-up to the gathering.Between 10,000 and 30,000 demonstrators were involved in the anti-Nato protests, according to French news agency AFP.