The militants launched the attacks overnight Thursday on more than two dozen police and border outposts. The office of Myanmar's leader, Aung San Suu Kyi, said military and border police responded to the attacks -- which left 12 security personnel and 77 Rohingya dead -- by launching "clearance operations."
Advocates for the Rohingya on social media have been reporting many army raids on villages, including killings and the burning down of homes. They have also posted videos they say show villagers who have fled to the mountains for safety.
Mohammad Nur, a Rohingya leader at an unregistered camp in Bangladesh's Cox's Bazar district, told The Associated Press by phone that he had heard that some 1,00,000 Rohingya had gathered along the border to try to enter Bangladesh, but the number could not be confirmed.
Nurul Kabir, a Rohingya man from Buddhist-majority Myanmar, said many Rohingya started fleeing their villages on Thursday morning after Myanmar soldiers and Buddhists started entering their areas.
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"He was crying, he was alone," he said. "I asked him where are your parents, and he was just crying. I took him and brought him with me."
Roshida Khatun, 40, crossed into Bangladesh this morning along with more than 30 other Rohingya.
Khatun told The Associated Press that she left behind her entire family along the border in Myanmar after she lost track of her whereabouts last night. She said that she and hundreds of others started walking to reach the border after her village was attacked by Myanmar soldiers.
"I have left everything behind," Khatun said. "My husband died 11 years ago, and now I have nobody. I have lost my entire family this time."
She said many others were still waiting to enter Bangladesh. "If they are not allowed in they will die," she said.
Farid Alam, a Bangladeshi who lives in Amtoli village, through which many Rohingya have crossed the border, told the AP today that over last two days, at least 2,000 Rohingya had entered Bangladesh. "The patrol in my area is not that tight often, especially during changing of shifts," he said.
Ali Hossain, a top government official in Cox's Bazar, said yesterday that authorities were on alert in the wake of the new violence in Myanmar.
He said that "Bangladesh is already overburdened" and "is unable to take more Rohingya."
"That's the order we have gotten from the Ministry of Home Affairs," Hossain said. "We have done enough and sheltered hundreds of thousands despite our limited resources."
Nur, the Rohingya leader, said Bangladeshi authorities had asked him and his associates to "discourage" their people in Myanmar from leaving the country.
A militant group, the Arakan Rohingya Salvation Army, took responsibility for the Thursday night attacks on more than 25 locations, saying they were in defense of Rohingya communities that had been brutalized by government forces.
Suu Kyi called the attacks "a calculated attempt to undermine the efforts of those seeking to build peace and harmony in Rakhine state."
The United States urged authorities to avoid a response that would inflame the tensions.
The clashes were deadlier than an attack by the militants on three border posts last October that killed nine policemen and set off months of brutal counterinsurgency operations by Myanmar security forces against Rohingya communities in Rakhine.
Human rights groups accused the army of carrying out massive human rights abuses including killing, rape and burning down more than 1,000 homes and other buildings.