Royal security tightened around Queen Elizabeth II as Islamic cell targets war memorial There were fears for Queen Elizabeth II as British police arrested four men over suspected terror plot. BRITISH police have swooped on a suspected Islamic terrorist ring amid fears the men were planning a terror attack on a Remembrance Day service today. The four suspects were ­arrested by armed counter terrorist operatives yesterday after intelligence suggested they were plotting an attack on Queen Elizabeth II or another high-profile figure, The Sun newspaper reported. The men, aged between 19 and 27, were picked up after months of surveillance as part of an "ongoing investigation into ­Islamist-related terrorism." Scotland Yard remained tight-lipped yesterday but confirmed it was an alleged ­Islamist plot to be carried out on British soil and was part of "an ongoing investigation into Islamist-related terrorism." Queen Elizabeth is due to lay a wreath at the cenotaph in London to mark the start to London's Remembrance Day commemorations. Her Majesty and British Prime Minister David Cameron were yesterday briefed on the arrests. Police outside a house in High Wycombe after four men were arrested in connection with an Islamist terror plot. Security has been tightened around Queen Elizabeth II following the arrest of four suspected Islamists. Last night, the British government and the palace said all Remembrance Day commitments including parades and wreath laying would go ahead as planned. This includes the Queen's planned wreath laying today. But there would be heightened security. Heavily-armed counter terrorist police swooped across west London and High Wycombe in the Thames Valley and arrested the four men and raided another four addresses. One of those arrested in Britain, 19-year-old Yusuf Syed is understood to have had his home raided in April during a separate investigation into ­potential jihadists. Two others, a 22-year-old and a 25-year-old, were ­arrested at separate addresses, while a 27-year-old was ­arrested in a car in the street. They were all arrested on suspicion of being concerned in the commission, preparation or instigation of acts of terrorism. The Royal Albert Hall in London, England. A second man had his passport seized by authorities recently after he planned to travel to the Middle East to take part in jihad. The timing of the arrests, on the eve of Remembrance Sunday, suggests there was concern the attacks were to be on military personnel taking part in the commemoration, one of the largest events in the UK. The foiled plot follows the shooting death of soldier Corporal Nathan Cirillo at Canada's parliament last month by Islamic extremist Michael Zehaf-Bibeau. The latest development is expected to trigger a review of security arrangements across the globe, including at the G20 leaders" meeting in Brisbane next weekend. It also followed a YouTube tirade by Bankstown teenager Abdullah Elmir, 17, who taunted Prime Minister Tony Abbott as he warned IS would not be stopping its murderous campaign "until the black flag is flying high in every single land." Security has been tightened for Remembrance Day ceremonies around Australia after the official terror alert level was raised to high on September 11. A spokesman for the War Memorial in Canberra said tighter measures were in place for Tuesday's events. Governor-General Sir Peter Cosgrove and defence chiefs will attend a Remembrance Day ceremony in Canberra. The PM will be in Beijing. Originally published as Royal security tightens around Queen