Chinese officials have blamed separatists from the far western region of Xinjiang for a deadly knife rampage at a railway station.
At least 29 people were reported killed and 130 others wounded when a group of attackers, dressed in black, burst into the station in the southwestern city of Kunming on March 1 and began stabbing people at random.
State news agency Xinhua reported that police shot dead four suspects.
Authorities described the attack as an "organized, premeditated, violent terrorist attack."
Kunming officials later said evidence from the scene pointed to separatists from Xinjiang, which is home to the Muslim Uyghur minority group.
President Xi Jinping urged "all-out efforts" to investigate the attack.
Based on reporting by AP, Reuters, and AFP