Numerous Rohingya villages in the north of Rakhine have also been torched, although the authorities have denied that security forces or Buddhist civilians set the fires.
Expressing concern over the situation, Stephane Dujarric, spokesperson to the UN Secretary-General said: "The reports we're getting, the pictures all of us are seeing are heart-breaking to say the least". He said, "The humanitarian situation it is catastrophic".
Suu Kyi, in her first address to the UN General Assembly as leader in September a year ago, defended her government's efforts to resolve the crisis over treatment of the Muslim minority. But the exodus has flooded neighbouring Bangladesh. That number has now tripled to almost 380,000, ' said Antonio Guterres.
In the meantime, diplomats said that Sweden and Britain requested a closed meeting of the United Nations Security Council on the "deteriorating situation" of the Rohingya, and hoped to hold the meeting on Wednesday.
There were more than 300,000 Rohinya in refugee camps and makeshift settlements in Bangladesh even before the latest unrest.
Bangladesh's appeal was echoed by Guterres.
Aid organizations are still not able to access all of Myanmar's restive Rakhine state, where deadly violence has displaced hundreds of thousands of minority Muslims, the United Nations food agency and the Red Cross said Friday in Geneva.
Bangladesh Prime Minister Sheikh Hasina has asked Myanmar to take back the Rohingya, saying the ethnic community has been living in Myanmar for centuries.
Suu Kyi has been repeatedly criticized over her response to the crisis.
"I think nobody wants to see a return to military rule in (Myanmar), nobody wants to see a return of the generals", he said, adding that Nobel Peace Prize laureate Suu Kyi should use her moral capital to highlight the plight of the Rohingya.
The Human Rights Watch (HRW) released new satellite imagery and sensory data showing that 62 villages and 948 buildings in Rakhine state were targeted by arson attacks between August 25 and September 14, 2017.
ARSA's statement on Wednesday said "it is prepared to work with security agencies to support counter-terrorism efforts in the region in order to prevent the infiltration of terrorist groups into Arakan". "There may be many terrorists who were involved" in the attacks last month, Aung Lynn said.