French police arrested 300 anti-NATO protesters during a summit in Strasbourg marking the 60th anniversary of the alliance, Interior Minister Michele Alliot-Marie said Sunday. Thousands of protesters took to the streets on Saturday -- police said they numbered 10,000 but organisers put turnout at 30,000 -- with some radicals setting fire to a hotel, a pharmacy and a former customs office. Alliot-Marie said police had been tracking hardcore protesters for the past days and "we prevented them from committing a certain number of acts of violence." "We carried out 300 arrests," she told RTL radio. Ten people were injured during clashes on Saturday, four of whom were police officers. Most of the injuries were from tear gas inhalation, she said Saturday.