PARIS (AP) — French police have arrested a 16-year-old at his Paris home to abort what they feared was a planned weekend attack, as the prime minister warned some 15,000 people in the country could be in the process of being radicalized. A security official said that France's intelligence services "detected a threat" and a judicial official said police moved into action Saturday fearing a planned attack this weekend. Intelligence agents suspected the boy planned to carry out a knife attack in a public place this weekend, the judicial official said, refusing to name a spot where it was thought the attack might occur.