The US has said it is important for Pakistan to investigate the Mumbai terror attack and bring to justice those responsible for it. It said the move will not only benefit Pakistan but the region as a whole. State Department spokesman P J Crowley told reporters at his daily news briefing that the US would continue to discuss with Pakistan the need to probe the 26/11 carnage that killed 166 people. Crowley added that the US policy is to fully cooperate with Pakistan on terrorism and to continue to work closely to help Pakistan battle the insurgency that now is a threat to Pakistan itself.