China Xinjiang blast killed 31 people, 90 injured: Report

The death toll was the highest for a violent incident in Xinjiang since days-long riots in Urumqi in 2009 between Uighurs and China's majority Han left almost 200 people dead. Thursday's attack also was the bloodiest single act of violence in Xinjiang in recent history.

"I heard four or five explosions. I was very scared. I saw three or four people lying on the ground," Fang Shaoying, the owner of a small supermarket located near the scene of the attack, told The Associated Press by phone.

Photos from the scene posted to popular Chinese social media site Weibo showed at least three people lying in a street with a large fire in the distance giving off huge plumes of smoke.

Others were sitting in the roadway in shock, with vegetables, boxes and stools strewn around them. Police in helmets and body armor were seen manning road blocks as police cars, ambulances and fire trucks arrived on the scene.

Urumqi was the scene of a bomb attack at a train station late last month that killed three people, including two attackers, and injured 79. Security in the city has been significantly tightened since that attack, which took place as Chinese President Xi Jinping was visiting the region.