A passenger bus carrying 28 people crossing the Laos-China border was shot by unidentified gunmen on Wednesday, the Chinese embassy said. 

The bus came from Kunming in Yunnan Province in southwestern China, and was going to Vientiane, Laos.

Three drivers and 25 passengers, all Chinese nationals, were inside the bus when their vehicle was shot around 9:00 pm on a road in Kasi, Vientiane.  

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Six were wounded while two of them were in severe conditions, foreign ministry spokeswoman Hua Chunying told the media. The driver was injured too, but was still able to drive the vehicle to safety. 

"The Chinese side has launched representations to the Laos side, requesting it to pay close attention and investigate clearly the relevant incident and also take measures to severely punish the assailants and protect the safety of Chinese citizens," she said in a daily press briefing.  

The injured Chinese nationals are now in a hospital in Laos.   

"Attackers do not ask for nationality when they attack. Therefore we call on all countries to make tangible and effective moves and enhance international cooperation on law enforcement to uphold peace and stability of all countries," Hua said, implying that the attack was random. 

Earlier on Wednesday just before the bus was shot, a pickup truck passing by the same road also received a rain of bullets, killings its driver. 

Earlier this March, a Chinese-backed company in Laos' Luang Prabang province was also attacked, killing one Chinese national and wounding three others. 

In late January, two Chinese were killed and one was injured after a bomb went off in Xaisomboun province. 

Tagsterrorism in Asia, northern Laos, bus shooting in Laos, Laos-China, Chinese nationals killed in bus shooting, bus shooting, unidentified gunmen, Yunnan province, Vientiane