Spain temporarily restored  border checks in its northeast and at two major airports (Barcelona and Gerona) early Saturday in a bid  to discourage protesters entering the country ahead of a European Central Bank  meeting in Barcelona.

Spanish authorities suspended  the Schengen Treaty, which allows unrestricted travel inside member nations, and  imposed controls at six border crossings with France and at Barcelona and Gerona  international airports.

Security forces have been  strengthened with 2,000 extra police on duty until midnight on May 4, when the  restrictions are due to end.