Footage shows the funeral of a Thai anti-monarchy protester who died this week while on a hunger strike in jail.

Netiporn Sanesangkhom, 28, was caged at the Central Women's Correctional Institution in Bangkok on January 26 for contempt of court. On the same day, the court revoked her bail on a lese majeste charge over a protest that caused a minute disruption to a royal motorcade.

The young woman had been on hunger strike ever since and was transferred to the hospital wing. However, she died on Wednesday.

State officials put her time of death at 11:22 - the symbolic number of the Section 112 law that bans criticism of royals she had campaigned against.

Mourners and fellow activists gathered for her funeral at a Buddhist temple in the capital on Thursday, May 16.

Netiporn's death sparked fury, grief, and renewed calls for justice reform. Bizarrely, Thailand is currently running for a seat at the United Nations Human Rights Council.

British lecturer Andrew MacGregor Marshall, one of the most vocal critics of the Thai monarchy, said: 'The world is watching. Stop this mad persecution of young people who have a different view from the dinosaurs.'

U.S. Ambassador to Thailand Ambassador Robert F. Godec said: 'We are saddened by the tragic death of Netiporn Sanesangkhom. We send our deepest condolences to her family and friends.'

Krisadang Nutcharat, a lawyer from Thai Lawyers for Human Rights (TLHR), said that Netiporn'a family received a call from an official at the Corrections Department's hospital at 6 am, informing them that Netiporn had fallen unconscious and that her heart had stopped beating, prompting medical personnel there to administer CPR.

He also said that he visited Netiporn in the hospital about a week ago and found that she had lost about 10kg in weight as a result of her hunger strike, adding that she complained of a headache, pains all over her body and swollen legs.

The Thalu Fah protest group said it has handed over a letter to Somkid Chueakong, Deputy Secretary General to the prime minister, demanding an investigation into Netiporn's death and urging bail and amnesty for political prisoners.

Thalu Fah leader Panusaya 'Rung' Sithijirawattanakul said: 'I am worried that the Department of Corrections Hospital will not release security camera footage when Netiporn was taken to Thammasat University Hospital.

'I also question the CPR process. I feel saddened by the loss of a political activist that occurred during the government under PM Srettha Thavisin.'

Meanwhile, Thai Priminister Srettha Thavisin said he has ordered a probe into Netiporn's death.

He said: 'It is sad about the loss of life... and I want to extend my condolences to the family. I have instructed the justice ministry to investigate details about her death.'

Netiporn, was one of the leaders of the 'Tha Lu Wang' group, which roughly translates to 'break through the palace'.

She was charged under two cases of Thailand's draconic lese majeste law, including one for conducting a public poll on royal motorcades, which see traffic halted across the city when members of the Royal Family go outside.

Thailand is said to have the 'world's harshest lese majeste law' with up to 15 years imprisonment for each count.

Critics said broad interpretations of what constitutes an insult to monarchy allow authorities to wield the law against government opponents.

Offenders face lengthy jail terms, with a number of people being exiled or mysteriously disappearing.