Switzerland has stiffened its border controls as a security precaution for the G8 summit in Evian, near Geneva, systematically checking vehicles and luggage, so travel in the area around Geneva could be disrupted. Authorities in Geneva have banned masked demonstrators from rallies and intend to hold organizers responsible for any disturbances. About 100,000 protesters are expected in the area for the summit, to be held June 1-3.