Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Pakistan in Mourning Following Deadly Plane Crash VOA News 29 July 2010 People carry casket of plane crash victim upon the arrival at Karachi airport, 29 July 2010. Photo: AP People carry casket of plane crash victim upon the arrival at Karachi airport, 29 July 2010. Pakistan is observing a national day of mourning Thursday following the worst aviation accident in the country's history. A plane carrying 146 passengers and six crew members crashed into a remote hillside near Pakistan's capital Wednesday, killing everyone on board. Rescue workers are still looking for the plane's flight data recorder as officials try to figure out what caused the crash. Pakistan's Federal Information Minister Qamar Zaman Kaira said rescuers had so far recovered 115 bodies, and that DNA tests would be needed to identify most of the remains. The Airblue jet was traveling from the southern port city of Karachi to Islamabad when it crashed into the Margalla Hills while attempting to land in rainy and cloudy conditions. Witnesses said the plane was flying very low just before the crash, while an Airblue spokesman said the pilots did not send any emergency signals. Pakistani President Asif Ali Zardari and Prime Minister Yousuf Raza Gilani expressed grief over the "tragic incident." U.S. President Barack Obama and Secretary of State Hillary Clinton offered condolences to the families of victims including two U.S. citizens. They said the American people stand with the people of Pakistan at this difficult time. U.N. chief Ban Ki-moon said he was deeply saddened by the tragic air crash and extended his heartfelt condolences to the people and government of Pakistan. A U.N. statement said Mr. Ban wrote to Prime Minister Gilani to express the sincere sympathy of the United Nations with Pakistan at this painful time. Some information for this report was provided by AP and AFP. .