WASHINGTON - Eighty-seven percent of US voters are now at least somewhat concerned about the safety of nuclear weapons in Pakistan, a new poll found. Sixty percent said they are very concerned while only 10 percent are not concerned about Pakistans nuclear weapons in the latest Rasmussen Reports survey released here Tuesday. The level of overall concern remained unchanged from last August, following former President Pervez Musharrafs resignation, but the number of those who said they are very concerned has jumped by 15 points. The poll is conducted among 1,000 likely voters across the country via telephone between May 1 and 2. The survey results came out at a time when US President Barack Obama is scheduled to meet leaders of Pakistan and Afghanistan to discuss potential nuclear proliferation and resurgent extremism on Wednesday at the White House. AFP adds: The security of Pakistans nuclear arsenal is still cause for concern in Washington despite reassurances that the weapons are out of reach of Taliban militants, the US national security adviser has said. General James Jones said in an interview with the BBC that he had been told by Pakistans army that the countrys nuclear stockpile was safe, but that Washington needed further guarantees. We have received many assurances from the military that this is something they have under control but this is very much an ongoing topic, he said. The world would like to know that on this question, that theres absolute security and transparency. Jones comments came as the Pakistani army continued to battle Taliban militants who have occupied areas of Malakand region, the fringes of which are only 100 km from Islamabad. Speaking in Washington, where President Asif Ali Zardari is due to meet US President Barack Obama this week, Jones said things are moving in a more positive direction in Pakistan, but said more guarantees were needed. If Pakistan doesnt continue in the direction that it presently is and were not successful there then, obviously, the nuclear question comes into view, he said. The notion that the countrys nuclear weapons could fall into Taliban hands was the very, very worst case scenario, said Jones. Were going to do anything we can within the construct of our bilateral relations and multilateral relations to make sure that doesnt happen. Obama will raise concerns about nuclear proliferation and resurgent extremism in talks this week with Zardari and Afghan President Hamid Karzai, the White House said Monday.