Strasbourg, France  - Several hundred anti-NATO protesters clashed with police in the French city of Strasbourg on Thursday, one day before leaders from the 28-member alliance were due to meet in France and Germany, France Info radio reported.

The demonstrators broke windows and set trash bins on fire before police were able to restore order.

Both Germany and France have deployed security forces to keep the order for the two-day summit marking the 60th anniversary of NATO's founding.

Some 14,600 police will be guarding the 3,500 delegates on the German side, while 10,000 will be patrolling the streets of Strasbourg, where the main talks will be held.

German security officials said they expect up to 25,000 demonstrators to turn up in Germany, around 3,000 of whom have been classified as potentially violent. (dpa)