Major Internet portals in China, including Yahoo.com and Sina.com, on Friday carried images of some of the Lhasa riot suspects wanted by police.
Phone numbers for the Public Security Bureau of Lhasa City were posted, along with the images of the suspects taken from videos. The bureau called on the public to provide tips that may lead to their capture, according to the websites.
Bureau sources said that, starting on Monday, they had issued 21 warrants for individuals suspected of participating in the unrest that broke out in the Tibetan capital on Friday afternoon.
The violence resulted in looted businesses and burnt-out residences, shops and vehicles, with 13 civilians killed and 325 injured. Damage is estimated at more than 200 million yuan (about 28 million U.S. dollars).
The pictures of the suspects were also carried in the local Lhasa media.
Two suspects, No. 3 and No. 5, were apprehended by police and another, the No. 4 suspect, surrendered to the authorities on Wednesday night, sources said.
Law enforcement authorities in Tibet Autonomous Region issued a notice last Saturday, urging lawbreakers in Friday's riot to stop their activities and offering leniency to those who surrendered.
The Tibetan higher people's court, the regional people's procuratorate and the regional public security bureau said in the notice the rioters had set fire to schools, hospitals, child-care centers, shops and residences, confronted government departments and assaulted law enforcement officers.
They had also smashed and burned vehicles, looted properties and killed innocent people, the notice said, adding that all these acts had violated China's criminal law.
The notice demanded that lawbreakers turn themselves in and promised leniency for those who surrendered by Monday on midnight.