(CNN) A new law which comes into effect from next week will punish homosexual sex and adultery with death in the small southeast Asian kingdom of Brunei.

Beginning on April 3, any individuals found guilty of the offenses will be stoned to death, according to a new penal code. The punishment will be "witnessed by a group of Muslims."

The country's strict new laws were announced in 2014, and have been rolled out gradually. The latest phase of implementation, including the brutal new provisions, was quietly announced on the Brunei attorney general's website on December 29, 2018.

Human rights groups were quick to express horror at the penal code, which will also order amputation as a punishment for theft.

"Brunei must immediately halt its plans to implement these vicious punishments, and revise its Penal Code in compliance with its human rights obligations. The international community must urgently condemn Brunei's move to put these cruel penalties into practice," Rachel Chhoa-Howard, Brunei Researcher at Amnesty International, said in a statement.

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