Angkana dies from impact of tear gas : Dr Pornthip

Dr Pornthip said she examined photos of body of Angkana before reaching this conclusion.

"The tear gas struck Angkana at the chest before exploding a second after. There will be no more investigation into the type of the weapons used in the incident."

"It is clearly showed that the injuries and death were caused by weapons police used," she said.

Dr Pornthip, who is also the director of the Central Institute of Forensic Science Thailand, said that police who used the tear gas may not know proper ways of shooting the tear gas which should be fired into the air not at people.

Police, on the other hand, claimed they used tear gas to disperse the protesters and dismissed suggestion that a gas canister fired by them was strong enough to kill a person.

There have been suggestions from many observers that some sort of explosives, not the tear gas caniste, may have killed Angkana.