British Foreign Secretary David Miliband Thursday called on Pakistan to show "zero tolerance" towards militant groups based in the country that have been blamed for the Mumbai terror attacks. "We know the attacks were carried out by Laskhar-e-Taiba operating from the territory of Pakistan," he said in a speech at the Taj Mahal hotel in Mumbai, one of the locations targeted by the gunmen who killed 165 people. "There must be zero tolerance towards such organisations," Miliband said. India blames the Lashkar-e-Taiba (LeT) for training, equipping and financing the 10 gunmen who used automatic weapons and hand grenades to bring havoc to city during a bloody siege that lasted 60 hours. Miliband emphasised that Britain was at risk of attack from similar extremists.