Refugee accounts of the latest spasm of violence in Rakhine have typically described shootings by soldiers and arson attacks on villages.
But there are at least several cases that point to anti- personnel land mines or other explosives as the cause of injuries on the border with Bangladesh, where 300,000 Rohingya have fled in the past two weeks.
AP reporters on the Bangladesh side of the border on Monday saw an elderly woman with devastating leg wounds: one leg with the calf apparently blown off and the other also badly injured. Relatives said she had stepped on a land mine.
Lt Col SM Ariful Islam, commanding officer of the Bangladesh border guard in Teknaf, said on Friday he was aware of at least three Rohingya injured in explosions.
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Bangladeshi officials and Amnesty researchers believe new explosives have been recently planted, including one that the rights group said blew off a Bangladeshi farmer's leg and another that wounded a Rohingya man. Both incidents occurred today. It said at least three people including two children were injured in the past week.
Myanmar Presidential spokesman Zaw Htay did not answer phone calls seeking comment today. Military spokesman Myat Min Oo said he couldn't comment without talking to his superiors. A major at the Border Guard Police headquarters in northern Maungdaw near the Bangladesh border also refused to comment.
Amnesty said that based on interviews with eyewitnesses and analysis by its own weapons experts, it believes there is "targeted use of landlines" along a narrow stretch of the north-western border of Rakhine state that is a crossing point for fleeing Rohingya.
The violence and exodus began on August 25 when Rohingya insurgents attacked Myanmar police and paramilitary posts in what they said was an effort to protect their ethnic minority from persecution by security forces in the majority Buddhist country.
In response, the military unleashed what it called "clearance operations" to root out the insurgents. Accounts from refugees show the Myanmar military is also targeting civilians with shootings and wholesale burning of Rohingya villages in an apparent attempt to purge Rakhine state of Muslims.