Tan used her blog to denounce corruption and injustice in Vietnam's legal system.
The mother of a prominent Vietnamese blogger has died after setting herself on fire ahead of her daughter's trial for propaganda against the Communist state, people close to the family said Monday.
Ta Phong Tan, a 43-year-old Catholic former policewoman, was arrested in September 2011 and has been held in detention along with two other bloggers, one of whose case has been raised by US President Barack Obama.
Tan's mother Dang Thi Kim Lieng set herself ablaze early Monday, according to Catholic activists and lawyers whose accounts to AFP were corroborated by reports on dissident blogs and the BBC's Vietnamese-language service.
"Her wounds were very serious and she died on the way to the hospital," said Dinh Huu Thoai, a priest close to the family of Tan, who is due in court in Ho Chi Minh City next week alongside the two other bloggers.
The trio are accused of "distorting the truth, denigrating the party and state" by posting hundreds of political articles on the banned website "Free Journalists Club" of Vietnam, as well as writing on their own blogs.

