KABUL (AFP) - Afghanistan remains the country worst affected by landmine explosions, with an average of 50 people killed or maimed every month despite massive clearing efforts, the United Nations said Monday. Afghanistan is dotted with landmines as a result of three decades of war and invasions. About 150,000 Afghans have disabilities resulting from mine blasts, said the director general of the UN's Mine Action Centre for Afghanistan. "Three years ago, Afghans were suffering because of mines... something like 150 people per month. Today it's an average of something like 45 to 50 people per month," the UN official, Haidar Reza, told reporters. "But keep in mind that 50 people per month is still a very high figure, and it puts Afghanistan at the very top of the list of the countries that suffer because of mines and unexploded ordnance," he said. The UN-funded programmeme cleared 380,000 anti-personnel mines and nearly 20,000 anti-tank mines over a period of 18 years through the end of 2007. In 2008, the programmeme cleared 82,000 anti-personnel mines and more than 900 anti-tank mines, Reza said. Two-thirds of Afghanistan has been cleared of landmines, with thousands of deminers working on the monumental task for years, but millions of people still live on mined land. In the past year, 50 deminers have been killed or disabled while doing their work, and more than a dozen more were killed in hostile action. Reza said insecurity and lack of adequate funds would make it more difficult to reach the goal of clearing the entire country of mines by 2013. Meanwhile, Afghan officials confirmed Monday that remains found last year were those of former president Mohammad Daud Khan, killed with many of his relatives in a Soviet-backed coup three decades ago. Khan's remains were with those of 16 relatives found in two mass graves on the outskirts of Kabul in a military training ground, deputy public health minister Faizullah Kakar told reporters. Khan and 18 members of his family, including his wife, several children and siblings, were killed on the night of April 27-28, 1978 when pro-Soviet Afghan communists stormed the presidential palace in a bloody coup. In August, officials had said that the graves contained at least nine of Khan's relatives but they were still trying to confirm if the ex-president and other members of his family were among them. Artificial teeth found in the grave had since been found to match an original cast made for the former president by a German dentist in 1970s, Kakar said. An examination of a skull and parts of a skeleton also had characteristics that matched Khan's physique, he said, citing other post-mortem tests and witness testimony. Further proof was the discovery in a grave of a golden amulet containing a small copy of the holy Quran, a present from a Saudi king to Khan, the deputy minister said. "This evidence leads us to conclude that the remains we have found are those of martyred president Daud Khan. We are 100 percent sure about it," said Kakar, who led a government investigation to identify the bodies. While the remains of Khan and his 16 relatives had been confirmed, those of two female relatives had still to be identified, he said. Authorities had opened 93 graves in a separate cemetery, based on public tip-offs and claims, in their search for the former president, Kakar said. They were led to the mass graves at the military training ground on information from former soldiers. The year after Khan was killed, the Soviet Union invaded Afghanistan, occupying the country for a decade before they were defeated in an uprising. Khan, who died when he was 68, had himself gained power in a coup, toppling King Zahir Shah, his cousin, in 1973 to end the monarchy and establish the nation's first republic. Zahir Shah, the last king of Afghanistan, died in 2007 after returning to Kabul in 2002 from 29 years' exile in Italy. A "glorious ceremony" was planned in the coming weeks to re-bury Khan and his relatives in proper fashion, Kakar said.