Two suspects and a citizen were killed in Wednesday's railway station terror attack in the regional capital of northwest China's Xinjiang Uygur Autonomous Region, police said Thursday.

An investigation showed one of the two suspects was Sedirdin Sawut, a 39-year-old man from Xayar County, Aksu in southern Xinjiang.

The two have long been involved in religious extremism. At 7:10 p.m. Wednesday, they stabbed people with knives and set off explosives at the exit of Urumqi south railway station.

The two suspects were killed by the explosion. An innocent citizen also died and 79 others were injured in the attack.

Some of the injured have been discharged from hospital. Local public order is normal.

Chinese President Xi Jinping urged "decisive actions" against violent terrorist attacks after the blast.

"The battle to combat violence and terrorism will not allow even a moment of slackness, and decisive actions must be taken to resolutely suppress the terrorists' rampant momentum," Xi said.

During an inspection tour to Xinjiang which ended on Wednesday, Xi said safeguarding the country's unity and fighting separatism are of the upmost importance and in the basic interests of all ethnic groups in Xinjiang.

While fighting terrorism, China will deploy a "strike-first" strategy against terrorists in this region to deter enemies and inspire people, he said.