Rebels were supported by the Kingdom of Serbia.[2] New taxes levied in the early months of 1910 led to Isa Boletini's activity to convince Albanian leaders who had already been involved in a 1909 uprising to try another revolt against the Ottoman Empire. The Albanian attacks on the Ottomans in Priştine (now Pristina) and Ferizovik (now Ferizaj), the killing of the Ottoman commander in İpek (now Peć), and the insurgents' blocking of the railway to Skopje at the Kaçanik Pass led to the Ottoman government's declaration of martial law in the area.