British Parliamentary Affairs Committee said 8, the British government requires urgent action, prevent citizens going abroad to Syria in war and other conflicts, because these people may accept the extreme thoughts, returned to the UK to engage in terrorist attacks. Congressional affairs committee responsible person also warned, Britain faced a "terrorist threat", the severity of not less than 13 years occurred in America "9 · 11" event. British Parliamentary Affairs Committee said in a statement, "the number of foreign war British citizens and western in recent years to an amazing degree." "We demand the immediate response, discouraged and prevent those who want to go to the war who leave." In recent months, the government of Britain and other European countries have warned President Assad of Syria, to join the Resistance Army Muslim could eventually pose a threat to their country. Security officials estimate, there have been hundreds of British citizens involved in the Syria conflict. Since the USA "9 · 11" terrorist attacks, the UK has been considered a primary goal of extremists. In 2005, the London subway terrorist attacks, 52 people were killed.