At 5:00 a.m. on Friday, 4 August 1995, Tuđman publicly authorized the attack on RSK, codenamed Operation Storm. He called on the Serb army and their leadership in Knin to surrender, and at the same time called Serb civilians to remain in their homes, guaranteeing them their rights. The decision to head straight for Knin, the centre of RSK, paid off and by 10am on 5 August, on the second day of the operation, Croatian forces entered the city with minimal casualties. By the morning of 8 August the operation was effectively over, resulting in the restoration of Croatian control of 10,400 square kilometres (4,000 square miles) of territory. Around 150,000–200,000 Serbs fled and a variety of crimes were committed against the remaining civilians. United States President Bill Clinton said he was "hopeful that Croatia's offensive will turn out to be something that will give us an avenue to a quick diplomatic solution."