Tight security at GOP convention Recent police killings in the U.S. and the latest terrorist attack in France have heightened concerns over security at the Republican National Convention, where huge crowds of protestors are expected and police must be prepared to deal with the open carrying of weapons as allowed by Ohio state law Event zone: Toy guns, knives, umbrellas, tennis balls and whole fruit banned inside 4.4sq-km area But open-carry gun law is to remain in place Secure zones: Weapons not allowed. Secret Service in charge 450m 1,500ft LAKE ERIE Cuyahoga River Parade route: Protesters with permits allowed to march in 50-minute slots UNITED STATES Cleveland OHIO CLEVELAND Media centre Speakers stage: Can be reserved for 30-minute slots Quicken Loans Arena: Main convention venue Police on duty: 4,000 Additional officers sent by federal government: 3,000 Federal grant to boost security: $50 million Additional sets of riot gear: 2,000 Source: Cleveland.com