Amina bint Abdul Halim bin Salem Nasser was executed on Monday in the northern province of Jawf for "practising witchcraft and sorcery"

London-based newspaper al-Hayat quoted a member of the Saudi religious police as saying Nasser was in her 60s. The official claimed she had tricked people into giving her money, claiming that she could cure their illnesses.

According to the report, she apparently charged up to $800 a session

The charges of 'witchcraft and sorcery' are not defined as crimes in Saudi Arabia", Philip Luther, Amnesty's interim director of the Middle East and North Africa, said.

"To use them to subject someone to the cruel and extreme penalty of execution is truly appalling," he added in a statement, which stressed the "urgent need" to stop executions.