A man who gunned down seven people, most of whom are members of his ex-wife’s family, in the northern Vietnamese province of Lang Son this week is being wanted nationally by the provincial police.

Criminal proceedings have been launched against Ly Van San, 50, who is now on the national wanted list for murder after killing two and injuring five others on Monday, Lang Son police said on Saturday.

Investigation documents show San and his second wife Hoang Thi Toan were divorced in 2015 after Toan had made a case against the ex-husband for domestic violence.

San has wanted to get back with Toan on multiple occasions since then but his intention has been consistently rejected by Toan and her family.

At around 9:00 pm on Monday, San carried an AK-47 assault rifle to the house of Toan’s sister Hoang Thi Hoai, 37, in Lang Son and opened fire on members of Hoai’s family who were having dinner at the back of the house.

Hoai’s 12-year-old son Pham Thanh Phong was killed on the spot after being hit by a bullet to his head.

San then walked to a nearby auto shop owned by Toan and Hoai’s older brother Hoang Quoc Huong, 43, and opened fire, killing Huong instantly.

Five people, including Hoai, Toan, Hoai’s sister-in-law Chu Thi Hong, and two mechanics - Vu Xuan Huong, 38, and Nguyen Van Tuyen, 19 - who work at Huong’s auto shop, were injured in the mass shooting.

Hundreds of police officers and border guards are on the hunt for San, who has been at large since the killing.

Authorities in China have also been asked to help capture San in case the gunman manages to flee into the neighboring country.

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