Hu Yaobang was purged in the late 1980s due to his 'liberal' tendencies towards systemic reform, and his departure from the political scene was initially seen as unfavourable towards Hu Jintao. Hu Jintao drew criticism from party elders for failing to criticize the ousted reformer. In 1988, Hu was transferred to become Party Regional Committee Secretary of the Tibetan Autonomous Region, while also taking on the role of Political Commissar of the local People's Liberation Army units. This made Hu effectively the number-one figure in the vast, restive region. A number of Tibetans have long been opposed to government policy in the region. Unrest and ethnic conflict were brewing, particularly anti-Communist Chinese sentiments among segments of ethnic Tibetan society. Minor clashes had been occurring since 1987, and when the scale of unrest grew, Hu responded with the deployment of some 1,700 People's Armed Police into Lhasa in February 1989 in an attempt to warn against further disturbance. Increased clashes culminated in serious rioting in Lhasa's core on 5 March 1989, five days before the 30th anniversary of the 1959 Tibetan uprising. What occurred after is a matter of dispute. Rioters accused the police of shooting them arbitrarily, and the police claimed that they had acted in self-defense. In addition, there was speculation that Hu delayed his orders to clamp down on the protesters until late into the evening, when the police chief was forced to act because the situation was spiraling out of control. The protesters were suppressed early into the next day, and Hu asked Beijing to declare martial law on 8 March.