The UN High Commissioner for Refugees (UNHCR) and UN Development Programme (UNDP) said in a joint statement that they needed full access to Rakhine state and were still awaiting permission for international staff to be based in the town of Maungdaw following requests made on June 14, Reuters reported.
The United Nations signed an outline deal with Myanmar in early June aimed at eventually allowing hundreds of thousands of Rohingya in Bangladesh to return safely and by choice. But the secret agreement offers no explicit guarantees of citizenship or freedom of movement throughout the country.
The UN agencies said that substantial progress was urgently needed in three key areas: "granting effective access in Rakhine State; ensuring freedom of movement for all communities; and addressing the root causes of the crisis".
More than 700,000 Rohingya fled Myanmar's western Rakhine state after a military crackdown that started in August last year in response to attacks by ARSA, a Rohingya armed group, on security posts.
Myanmar has rejected accusations of ethnic cleansing and dismissed most accounts of atrocities, blaming Rohingya "terrorists". It says it is ready to accept back those who fled.
The Rohingya, who regard themselves as native to Rakhine state, are widely considered as interlopers by Myanmar's Buddhist majority and are denied citizenship.
The UN said that Rohingya remaining in Rakhine are under local orders that severely restrict their freedom of movement, preventing them from reaching jobs, school and health care, and called for these to be lifted.