BEIJING, June 30 -- Four people have been prosecuted for their involvement in a terrorist attack at a railway station in Kunming on March 1, China's top procuratorate announced on Monday.

The Kunming Municipal People's Procuratorate found that the suspects were involved in organizing, leading or taking part in the terrorist attack as well as intentional homicide, said a statement issued by the Supreme People's Procuratorate.

A group of assailants armed with knives attacked civilians at the railway station in the provincial capital of southwest China's Yunnan Province, causing 29 deaths and injuring another 143.

Police shot to death four of the attackers at the station and arrested four others.