Government officials of Kashgar, a city in China’s northwest Xinjiang Special Autonomous Region, said that its “initial probe” found operatives of an attack over the weekend had gathered supplies and conducted training in Pakistan, the Wall Street Journal reported. Kashgar was struck by two separate attacks on Saturday and Sunday, allegedly perpetrated by members of the Uyghur ethnic minority , which caused 20 deaths. Allegations that the assailants may have come from Pakistan-based camps of the East Turkestan Islamic Movement (ETIM), an extremist outfit seeking Xinjiang’s independence, could throw sand into the Sino-Pakistani relationship, which Islamabad has been keen to portray as an “all-weather friend[ship].” Pakistan has pledged full cooperation with Chinese authorities. Two of Pakistan’s other neighbors, Afghanistan and India, also accuse it of harboring militant Islamist groups in its territory.