The company spokesman declined comment," according to one report. On 31 August, Interior Ministry spokesman Nurdilda Oraz said in the Kazakh capital, Nur-Sultan, that the police "did not associate" the "common crime" of Karabalayeva's murder with her father's activities. In the same report, the KMG EP press office said the father was not the trade union chairman and had never been a strike activist but worked as an engine driver for the company until 27 July this year. Also in August, a labor lawyer, Natalya Sokolova, was sentenced to six years in jail for 'organizing illegal gatherings' at the smaller Karazhanbas field, which was also on strike. Earlier, in July, the singer Sting had cancelled a concert after he was briefed on the strike by Amnesty International. These labour strikes were causing a 6% output drop in KazMunayGas production, according to a company spokesman. On 26 August, KMG EP fired around 900 striking workers and replaced them with new recruits from the area. The company said that production at Uzen had stabilized. Karazhanbasmunai, a joint venture between KMG EP and China’s Citic, also fired around 500 workers. Until mid-September 2011, daily protests by angry protestors, many of whom used to work at Uzen, continued in Zhanaozen's main square "in a rare display of popular dissent". The unrest has persisted, with violence erupting on independence day, 16 December 2011, killing 16 and leaving about 100 injured as police opened fire on the demonstrations. Army units and armoured personnel carriers were sent in by the Interior Ministry to quell the ensuing protests, which saw government and Uzenmunaigaz buildings set alight by demonstrators. The labor conflict resulted in the resignation of KazMunaiGas EP Chief Executive Officer Askar Balzhanov on 22 Dec.. President Nursultan Nazarbayev also replaced the head of parent company KazMunaiGaz National Co., Bolat Akchulakov, and fired his own son-in-law Timur Kulibayev, who headed the country’s sovereign wealth fund.