An anonymous reader writes "The Washington Post reports, "British law enforcement agencies averted a plot to orchestrate a large-scale terror attack similar to the assault on Kenya's Westgate mall, an official said Monday. Police were questioning four men in their 20s on suspicion of terrorism after they were detained Sunday in pre-planned, intelligence-led raids. A British security official said the men were planning a shooting spree akin to the Westgate attack in Nairobi, in which at least 67 people died. ... in a series of statements, the force said the men were all British nationals between the ages of 25 and 29, with roots in Turkey, Pakistan, Algeria and Azerbaijan. ... the London police firearms unit took part in the arrests. British police rarely carry weapons and their involvement suggested concern that men might have been armed." — The Sydney Morning Herald has video. Prime Minister Cameron recently expressed concern regarding such a possibility."