URUMQI, Aug. 12 (Xinhua) -- Twenty-one people were injured after a 5.8-magnitude earthquake hit northwest China's Xinjiang Uygur Autonomous Region Thursday afternoon, local authorities said Friday.
The quake rocked a border area between the region's city of Atux in the Kizilsu Kirgiz Autonomous Prefecture and Kashgar Prefecture at about 6 p.m. Thursday.
Four of the 21 injured are in critical condition, local authorities said.
The quake also toppled 147 houses and severely damaged 171 others, a spokesman with the Kashgar Prefecture government said.
No deaths have been reported in the earthquake, said the spokesman.
The operation of two passenger trains was suspended due to the earthquake, which damaged railway lines and bridges in the region, according to the railway bureau of Urumqi, the region's capital city.
A train bound for the city of Kashgar from Urumqi was forced to stop at the Aksu train station, located about 460 km northeast of Kashgar. Passengers on the train were offered free transportation to their destinations via bus.
Normal operation of the halted railways had yet to be resumed by midday Friday, according to the railway bureau.
Also on Friday, the Ministry of Civil Affairs said emergency relief materials, including 1,000 tents, 3,000 quilts and 3,000 coats, were transferred on Thursday night to the quake zone from a government relief warehouse in Kashgar.
As of 8 a.m. Friday, more than 1,000 people had been evacuated, figures from the ministry showed.