A Sudanese woman, believed to be about 20, has been sentenced to be stoned to death for adultery, rights groups and lawyers have said.

Intisar Sharif Abdalla is being held near Khartoum, shackled in prison with her baby son.

Campaigners condemned Thursday’s ruling, saying it violated international standards and raised concerns that Sudan might start applying Islamic law more strictly following the secession of mostly non-Muslim South Sudan last year.

Abdalla was sentenced by the Ombada criminal court, just west of the capital, on April 22, court documents seen by the Reuters news agency showed.

Two lawyers assigned to her case, who declined to be named, said they were launching an appeal, adding Abdalla appeared to be under severe psychological strain.

“She’s in dire need of a psychiatrist because she appears to be in a state of shock from the social and family pressures she’s under,” one lawyer said.

Abdalla was illiterate and did not have a lawyer or interpreter in the courtroom, although Arabic is not her native language, the lawyers and activists added.

Arabic is the main language in the overwhelmingly Muslim nation, though a wide range of smaller languages are also spoken, particularly in tribal areas. It was unclear where Abdalla came from.