The report added that new militias may try to "seek sources beyond the ad hoc community donations that have so far sustained them."
UN warns of internal displacement
The UN warned last week that 230,000 people have been displaced by fighting in Myanmar and require aid.
Fighting has been costly for communities in regions like northern Kachin and Shan States, where ethnic minority armies have a long history of hostilities with the Tatmadaw.
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Relief operations were being hindered by armed clashes and violence, the UN said.
The International Crisis Group said in its report that "Local networks and humanitarian agencies are unable to adequately assist" displaced people.
This is due to "security and access restrictions, including military arrests, confiscation of supplies, and killings of those trying to deliver aid."
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