Thanks for the pledge of five billion, but actually that is not going to be enough. That is the message from Washington today after Pakistan secured fresh financial assistance at a donors conference in Tokyo.The pledges came after Pakistan promised to step up the fight against militants. The US special envoy to Pakistan and Afghanistan, Richard Holbrooke, said: “In fact, five billion dollars is not enough for Pakistan, the second largest Muslim country in the world, one of the five or six largest countries in the world. The terrorists in western Pakistan are planning other attacks around the world.” There is international concern that economic hardship in Pakistan could end up boosting support for al Qaeda and other militant groups. Washington says more needs to be done to strengthen the government and deal with problems in tribal areas.