LONDON, Dhu-AlHijjah 17, 1435, Oct 11, 2014, SPA -- British counterterrorism forces are monitoring "thousands" of potential extremists in the capital's metropolitan area, London Mayor Boris Johnson said in a newspaper interview published Saturday, as police continue to question five men arrested on suspicion of terrorist offenses, AP reported. His comments came as police chiefs warned police officers throughout Britain to use extra care because of an increased terror threat. --SPA 20:14 LOCAL TIME 17:14 GMT www.spa.gov.sa/w