WASHINGTON - US President George W Bush had telephone conversations with leaders of Pakistan and India Wednesday and all agreed on the need to avoid any action that would increase tensions in the wake of Mumbai attacks, the White House said. Bush also urged both leaders to cooperate in the investigation into the deadly strikes. Bush "called prime minister (Manmohan) Singh of India and separately president (Asif Ali) Zardari of Pakistan. President Bush urged both ... to cooperate with each other in the Mumbai attack investigation as well as on counter-terrorism in general," Deputy Press Secretary Gordon Johndroe said at a briefing in Crawford, Texas, where the US leader is holidaying. It was the latest diplomatic move by President Bush, who steps down on January 20, to try and ease tensions between the nuclear armed neighbours. The United States wants Pakistan to stay focused in fighting militants in the tribal areas and not shift its forces from there to the its eastern border with India. "All the three leaders from the United States, India and Pakistan agreed that no one wanted to take any steps that unnecessarily raise tensions," Johndroe added. Haq Nawaz from Islamabad adds: President Zardari Wednesday reaffirmed Pakistan's policy, during a telephonic conversation with his US counterpart George W Bush that Pakistan would not allow non-state actors to use its land for planning a terror plot against other countries. The US President telephoned Asif Zardari to discuss the issues of war on terror and regional tension after November attacks on Mumbai. The Pakistani leader assured him that Pakistan stuck to its policy of not permitting anyone to use its soil against any country including India, said a Press statement issued here. The two leaders discussed the situation in the region and bilateral relations. In the discussion, President Zardari reiterated the government's stated position that action would be taken against anyone found guilty in Mumbai carnage. President Bush lauded Pakistan's efforts against the menace of terror and steps taken by it in the wake of Mumbai attacks. He hoped that the tension between Pakistan and India would subside and the situation would become normal in the days to come. Bush's phone conversation with Zardari was the latest of contacts between top US leaders and senior officials in the wake of the Mumbai terror attacks, which sparked tension with India. Agencies add: "President Zardari reiterated the position of the government of Pakistan that it would not allow its territory to be used by non-state actors for launching attacks on other countries," his spokesman Farhatullah Babar told AFP. Zardari said "anybody found involved in such attacks from the soil of Pakistan will be dealt with sternly," the spokesman said, without giving further details of the conversation. Bush and Zardari also discussed bilateral relations, the spokesman said.