The organization that oversees the Nobel Peace Prize said Friday the 1991 prize awarded to Myanmar’s Aung Sang Suu Kyi cannot be revoked.

Olav Njolstad, head of the Norwegian Nobel Institute, said in an email to The Associated Press that neither the will of prize founder Alfred Nobel nor the Nobel Foundation’s rules provide for the possibility of withdrawing the honor from laureates.

"It is not possible to strip a Nobel Peace Prize laureate of his or her award once bestowed," Njolstad wrote. "None of the prize awarding committees in Stockholm and Oslo has ever considered revoking a prize after it has been awarded."

An online petition signed by more than 386,000 people on Change.org is calling for Suu Kyi to be stripped of her Peace Prize over the persecution of Myanmar’s Rohingya Muslim minority.

Suu Kyi received the award for "her non-violent struggle for democracy and human rights" while standing up against military rulers.