Security was stepped up in key areas, and police forces were put on high alert since Thursday, also following Wednesday's terror attack in London. Two security zones were put in place around Rome's sensitive districts, including parliament and presidential palace, and around the Capitoline Hill, where the celebrations of the 27 European leaders took place on Saturday. The most restricted zone -- namely the "Blue Area" -- are off-limits for all transport means and all citizens on Saturday, including those taking part in various rallies planned for the event. Checkpoints were set up at the main gates to the areas, and about 100 surveillance cameras were added to help reinforce controls.