The discovery of human body parts, including a woman's head, in Klong Bangkok Noi and Klong Bangkok Yai has sparked a murder investigation.

Police said on Wednesday that the dismembered body parts belonged to the same person -- probably a woman because of jewellery, long hair, painted nails and teeth braces.

However, police had not yet ruled out the possibility that those parts belonged to a transgender person.

The age and the nationality had yet to be determined, said police, although tattoos on the back of the body suggested that the person might be Thai.

Investigators believed it was murder and the dismembered parts were likely dumped into the Chao Phraya River before being swept away by the current into Klong Bangkok Noi and Klong Bangkok Yai.

Investigators were examining CCTV footage in the areas where the body parts were found.

According to Thai media reports, the headless torso was first found floating under Arun Amarin bridge in Bangkok Noi area around noon.

Later, the head was found floating near Ansorissunnah Royal Mosque in Bangkok Noi. When police placed the head back on the torso, they determined the throat had been slashed by a sharp object.