A Security Council mission led by Diego Arria arrived in Srebrenica on 25 April 1993 and, in their subsequent report to the UN, condemned the Serbs for perpetrating "a slow-motion process of genocide." The mission then stated that "Serb forces must withdraw to points from which they cannot attack, harass or terrorise the town. UNPROFOR should be in a position to determine the related parameters. The mission believes, as does UNPROFOR, that the actual 4.5 km (3 mi) by 0.5 km (530 yd) decided as a safe area should be greatly expanded." Specific instructions from United Nations Headquarters in New York stated that UNPROFOR should not be too zealous in searching for Bosniak weapons and, later, that the Serbs should withdraw their heavy weapons before the Bosniaks gave up their weapons. The Serbs never did withdraw their heavy weapons.