"Police in northwest China's Xinjiang Uygur Autonomous Region on Sunday captured the only rioter at large after a violent terrorist attack", state-run Xinhua news agency said.
Reports said China poured security forces for rounf-the-clock security to prevent riots from spreading in the troubled region.
Yu Zhengsheng, member of the influential Standing Committee of ruling Communist Party of China (CPC) who visited the province, said China will strike hard on violent terrorist attacks according to law and maintain social stability in Xinjiang which was hit by violent terrorist attacks in the past few days.
China will impose severe punishment on those taking part in violent crimes, Yu said a meeting attended by officials from across Xinjiang.
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"We will step up actions to crack down upon terrorist groups and extremist organizations and track the wanted," Yu said.
Muslim ethnic Uygurs oppose the expanding settlements of the majority mainland Han Chinese in parts of Xinjiang.
Xinjiang has achieved sound economic development in recent years, but separatists in and outside the country have been escalating their efforts and those deep-seated problems challenging Xinjiang's social stability have not been completely solved, Yu said.
Safety precautions must be taken, especially for key areas and institutions, he said, calling for efforts to mobilise the public and CPC members.
He also said authoritative information on the attacks should be released in a timely manner, and efforts must be taken to promote China's ethnic and religious policies as well as laws and regulations.
Also at the meeting, Meng Jianzhu, secretary of the Commission for Political and Legal Affairs of the CPC Central Committee, made detailed anti-terror arrangements in Xinjiang.
Law enforcement agencies should severely crack down on violent terrorist activities, with precautionary and preemptive measures, to guarantee social stability in Xinjiang, Meng said.
There are no detailed reports yet of what happened in Xinjiang which has been witnessing periodic but heavy violence since 2009 riots between native Uygur Muslims and ethnic Chinese Han settlers from mainland.