Ancient artefacts dating back 4,000-7,000 years have been found in a cave in the northern Province of Ha Giang's Bac Me District.
Trinh Nang Chung, head of the excavation team, said two tombs have been excavated in the Khuoi Nang Cave.
Archaeologists said one of the tombs contained the bone fragments and teeth of an adult male, while the other held a child whose sex has yet to be determined. The grave of the adult also contained stone tools.
Archaeologists also found hundreds of stone tools in the cave, including hatchets, hoes and knives, together with heaps of red stone powder, which they believe is painted on the corpse so that the dead person reaches the afterlife.
Chung said prehistoric people of the Hoa Binh – Bac Son culture, dating from 6,000-7,000 years ago, first lived in the cave. The latest traces date back 4,000 years.