A Cambodian court on Tuesday upheld a 2½-year prison term against a prominent land rights activist accused of inciting violence at a protest she helped lead outside of Prime Minister Hun Sen's residence, as dozens of her supporters outside conducted a "cursing ceremony" against national leaders and judges.

Tep Vanny was convicted in late February of aggravated intentional violence from the March 2013 protest, in which several government security personnel were hurt. The Appeal Court on Tuesday concluded that the trial followed legal procedures.

Wearing an orange prison uniform, Tep Vanny condemned the decision as an "injustice."

"I became victimized because my land was grabbed, and now I have been put in prison," she shouted outside court before security guards pushed her into a van.

Tep Vanny is known for demonstrating against evictions from the capital's Boeng Kak lakeshore community, where the government granted a land concession to a Cambodian tycoon and a Chinese company to develop a luxury residential and commercial community.

The protest at Hun Sen's residence in Phnom Penh, the capital, was among several demanding compensation for the evictions. A melee broke out when guards refused to let the protesters deliver a petition.

At her February trial, Tep Vanny said she was the victim in the case, and accused the court and the police of unfair treatment. She said the protesters, who were all women, were not violent, and that it was the security forces who attacked them.