An angry truck driver deliberately mowed down a group of teenagers and their parents in south China, killing five and wounding 19, the country's state media reported.
The incident appears to be the latest of several attacks carried out by men who feel they have been mistreated by the authorities.
Police in Guangdong province said the 34-year-old driver, surnamed Luo, had expressed a desire to revenge himself on society after officers confiscated his unlicensed motorbike.
They told a press conference they shot and killed the man at the wheel of his vehicle to prevent him causing further deaths.
Police said Luo, a migrant worker from Hubei province, was "introverted and intolerant" and had become embittered by work and marital problems. When traffic officers confiscated his driving licence and motorbike last month, because the vehicle had fake licence plates, he wrote a letter to his wife and parents saying he did not want to live any more.