The United Nations human rights chief warned Wednesday that widespread abuses of minority rights in Myanmar threatened to undermine reforms in the country.

The United Nations human rights chief warned Wednesday that widespread abuses of minority rights in Myanmar threatened to undermine reforms in the country.

"Myanmar had promised to end the era of political prisoners, but now seems intent on creating a new generation by jailing people who seek to enjoy the democratic freedoms they have been promised," UN High Commissioner for Human Rights Zeid Ra'ad Al Hussein said in a statement.

He said the world had hailed the transition in Myanmar since a quasi-civilian regime took power in 2011 after decades of military rule "as a story of promise and hope."

"But recent developments relating to the human rights of minorities, the freedom of expression and the right to peaceful protest are calling into question the direction of that reform and even threatening to set it back," he said.

Among the worrying developments was a government announcement last week that identity cards for people without full citizenship, including Muslim Rohingya, will expire within weeks.

"The decision appears designed to prevent 'white card' holders - the majority believed to be members of Myanmar's stateless Rohingya Muslim minority - from being eligible to vote," Zeid warned.

Many of Myanmar's roughly 1.3 million Rohingya are stateless and subject to restrictions that affect everything from their ability to travel and work to the permitted size of their families.

Zeid said the Myanmar government even opposes the use of the term "Rohingya", insisting that denying the group's right to self-identification "should sound a clear warning bell."

The UN rights chief also voiced alarm at escalating violence between the military and rebels in the remote Kokang region near the Chinese border, where more than 130 people have died since February 9 and tens of thousands have reportedly been displaced.