ISLAMABAD/LAHORE/WASHINGTON Wasting no time after US President Barack Obamas immunity plea for US shooter Raymond Davis, interpreted 'threadbare by US Senator John Kerry on the ground, the Pakistan Foreign Office late Tuesday night proclaimed diplomatic immunity for the US double murderer whose criminal act cast a chill on the Pak-US relations. In a rare defence by a US president of a murder accused, Barack Obama said the United States considered Raymond Davis a diplomat and Pakistan must also do so. On the other hand, the visiting US Senator, John Kerry promised that Raymond Davis would be tried in a US court. The Americans believe in the rule of law, he told a select group of journalists in Lahore. Following the high-profile prodding, the Foreign Office wrote to the Law Ministry, Raymond Davis is a diplomat and enjoys diplomatic immunity. He was appointed as a diplomat in the US Consulate. Another report said the Pakistani government has decided in principle to hand over Davis to Washington. Senator Kerry who arrived in Lahore is the co-author of the Kerry-Lugar-Berman Act, which triples non-military foreign assistance to Pakistan to $1.5 billion per year over five years. His arrival carried a lot of symbolic value for the Pakistan government who largely depends on American assistance, political as well as financial. Talking to journalists, Senator Kerry said that Raymond Davis would be tried in American courts, assuring that all the facts would be sorted out with regard to his case. Senator Kerry expressed sorrow on behalf of the American people over the killing of Pakistani citizens. He said the relationship between the two countries would not be allowed to derail over one man. To a question, Sen Kerry said that the Davis case had nothing to do with the Pakistani courts as Davis enjoyed diplomatic immunity under the Vienna Convention. In Washington, President Obama urged Pakistan to free Davis, while insisting that he was not callous about the deadly shooting that led to the US employees arrest. In his first public remarks on the case, Barack Obama said that detained official Raymond Davis enjoyed diplomatic immunity under the Vienna Conventions. We expect Pakistan to abide by the same convention, Obama told a news conference. Were going to be continuing to work with the Pakistani government to get this person released, he said. Obviously, were concerned about the loss of life. Were not callous about that, but there is a broader principle at stake, Obama said. Obama said that diplomatic immunity was critical because otherwise diplomats who deliver tough messages to countries where we disagree with them will start being vulnerable to prosecution locally. Thats untenable. It means they cant do their job, Obama said. President Barack Obama said the United States has been very firm with Pakistan in demanding the release of the detained American diplomat. But President Barack Obama made no mention of Senator John Kerry, chairman of the Senate Foreign Relations Committee, who he dispatched to Islamabad to resolve the crisis over the arrest of Davis. With respect to Mr. Davis, our diplomat in Pakistan, weve got a very simple principle here that every country in the world that is party to the Vienna Convention on Diplomatic Relations has upheld in the past and should uphold in the future, Barack Obama told reporters. If our diplomats are in another country, then they are not subject to that countrys local prosecution. We respect it with respect to diplomats who are here. We expect Pakistan, thats a signatory and recognise Mr. Davis as a diplomat, to abide by the same convention. The US government had earlier said that it will provide evidence in a Pakistani court that US national Raymond Davis is entitled to diplomatic immunity. US State Department spokesman Philip J Crowley told reporters that the US government would file a petition for Davis release in a court on Thursday (tomorrow) and provide evidence regarding Davis diplomatic immunity. Sen Kerry was expected to meet the Sharif brothers at Raiwind late on Tuesday night. Before leaving Washington for Pakistan, Kerry had contacted PML-N Quaid Nawaz Sharif on the phone and expressed his intention of having a meeting, media reports said. In an effort to resolve the Pak-US impasse, visibly mellowed US Senator stressed that Pakistan and the United States should focus on their many mutual interests instead of letting the dispute over a jailed American jeopardise relations. This one case should not be allowed to get in the way of Pakistan-US relations. In my capacity as head of the Foreign Relations Committee, I am here to make this relationship grow, which has been strengthened over a period, he said, while making a deliberate effort at not touching on any other contentious issue. Sen Kerry was talking to a select group of mediapersons at the US Consul Generals residence. This is for the second time that the Consul has invited only a select group to cover the media talk. Previously it was for 'press statement of Carmela Conroy the last week. Sen Kerry reiterated the US stance, while regretting the deaths of two Pakistanis. He pledged Davis would be tried in an American court. However, he added, It is a strong belief of our government that this case does not belong to a local (Pakistani) court, because this man has diplomatic immunity. He also asserted that he would give non-political answers, and would not get into the details since it is not my job, and others should do it. Kerry will also hold talks with senior officials in Islamabad, and reaffirm US support for Pakistan. When quizzed about the divergent views of the two countries regarding the diplomatic status for the accused, Kerry reminded the mediamen the assertion by PPPs Fauzia Wahab and Interior Minister Rehman Malik who spelled out immunity for Davis. To Kerry, ex-foreign minister Shah Mahmood Qureshis view was a mere difference of opinion. He called Qureshi his friend. Kerry said emotions should not be allowed to hinder the path of development, and elimination of fundamentalism. It is also learnt that future talks in Islamabad may focus on Pakistan seeking a written guarantee that Raymond Davis would be tried in a US court.