Around 30,000 French and German police were today moving into position around three cities on both sides of the Rhine before a Nato summit involving President Barack Obama and 25 other leaders.
The meeting on Friday and Saturday in the French city of Strasbourg and the German cities of Kehl and Baden Baden, follows the tightly monitored G-20 summit in London.
French Defence Minister Michele Alliot-Marie said it was France’s biggest security operation in years.
She warned of possible terrorist acts and clashes over Afghanistan.