UN High Commissioner for Human Rights Michelle Bachelet holds a news conference at Centro Cultural Espana in downtown Mexico City, Mexico April 9, 2019 REUTERS/Carlos Jasso

GENEVA (Reuters) - United Nations human rights chief Michelle Bachelet said on Thursday she was concerned that a Bahrain mass trial that revoked the nationality of 138 people this week had not met international fair trial standards.

A court in Western-allied Bahrain sentenced 139 people to jail on terrorism charges on Tuesday and revoked the citizenship of all but one of them, the public prosecutor said, in the latest mass trial in the Gulf Arab state.

“There are serious concerns that the court proceedings failed to comply with international fair trial standards, with a large number of the accused reportedly tried in absentia,” Bachelet said in a statement. Revocation of nationality can have serious consequences in daily life, including the denial of the right to health, education and freedom of movement, she added.