下文中at that time具体指的是哪个时间（段）？
The current fighting started on September 27. It has been described as the worst in the territory since the early 1990s. At that time, as many as 30,000 people were killed before Russia helped negotiate a halt to the fighting. The ceasefire agreement left the dispute between Armenia and Azerbaijan frozen. Both the United States and France supported the deal.
（本文来自：VOA 最近的报道）