BEIJING — The authorities in China’s troubled Xinjiang region charged Monday that the leader of the first of two lethal assaults over the weekend had trained in Pakistan, an unusually specific accusation that could hint at growing Chinese impatience with Pakistan’s inability to control radical groups operating within its borders.

The accusation, made by local authorities in the historic city of Kashgar, came as the head of Pakistan’s spy agency, the Directorate for Inter-Services Intelligence, was completing a visit to Beijing at which rising violence by predominantly Muslim, ethnic Uighur separatists in Xinjiang was almost certain to have been discussed. Some Pakistani news reports placed the agency’s director, Lt. Gen. Ahmed Shuja Pasha, in Xinjiang as the second spate of violence in Kashgar flared on Sunday.

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