Brussels remained on the maximum level four of the country’s terror alert system on Sunday, indicating a “serious and imminent” threat of attack, while the rest of the country would be at level three, meaning a possible and probable threat. Public was advised to avoid crowds in the capital. Clubs and venues have canceled events. The Belgian National Security Council is to meet at 4pm UK time to discuss security measures in Brussels on Monday. Schools could be shut in Brussels tomorrow. Metro closure and cancellation of events could continue into the working week. The UN Security Council on Friday authorized nations to “take all necessary measures” to fight Islamic State (IS) group jihadists after a wave of attacks across the world.