Myanmar's army may be committing gross human rights violations under cover of a mobile phone blackout in parts of Myanmar's Rakhine and Chin states, U.N. special rapporteur Yanghee Lee said on Monday.

Lee, an independent expert who reports to the U.N. Human Rights Council on human rights in Myanmar, said nine townships had been blacked out, with no media access and serious restrictions on humanitarian organizations.

"I fear for all civilians there," Lee said in a statement.