Police in the northern province of Bac Ninh are seeking to file charges in three different cases against a man who allegedly planted explosives on two vehicles, killing two and injuring one, and also faked a university degree

A report on the VnExpress newswire Monday said police have asked prosecutors to charge Nguyen Duc Tiem, 34, with murder, destroying properties, and faking documents.

Investigations have concluded that on November 30 last year Tiem planted explosives on the motorbike of his sister-in-law Nguyen Thi Quynh, 30.

The bike exploded the next morning when Quynh, who was three months pregnant, was taking her four-year-old daughter, Nguyen Khanh Van, to school.

The mother was killed on the spot, while the child succumbed to serious injuries later in the hospital.

Police said Tiem murdered Quynh over trivial daily conflicts that had arisen between them since he and his wife moved next door to the deceased's house in 2010.

Earlier, on June 18, 2010, he had also planted explosives on the bike of his close friend, 30-year-old Le Duc Trung, because he suspected the latter of having an affair with his wife.

The explosion, which happened in the northern province of Hai Duong, cost Trung his left leg.

The VnExpress said that during their investigations, Bac Ninh police found that Tiem had faked a university degree to get a job at a hotel.