The 1923 law established during Burma's British colonial-era carries a maximum prison sentence of 14 years.
At least 9,000 people died in Myanmar between August 25 and September 24, bringing the death toll during the first month of the military crackdown to nearly 14,000 - including 1,000 children under age 5.
"The findings of MSF's surveys show that the Rohingya have been targeted, and are the clearest indication yet of the widespread violence that started on August 25 when the Myanmar military, police and local militias launched the latest "clearance operations" in Rakhine in response to attacks by the Arakan Rohingya Salvation Army", it said.
"We met and spoke with survivors of violence in Myanmar, who are now sheltering in overcrowded and unsanitary camps in Bangladesh", MSF's medical director Sidney Wong said. The organisation, which is also known as Doctors Without Borders said that this is "the clearest indication yet of the widespread violence" by the Myanmar authorities.
"We heard reports of entire families who perished after they were locked inside their homes, while they were set alight", Wong said.
According to the United Nations, more than 600,000 Rohingya Muslims - a persecuted, stateless minority in predominantly Buddhist Myanmar - have fled across the border from the northern tip of Rakhine since then.
Bangladesh and Myanmar have agreed to cooperate on the repatriation of the displaced Rohingya but rights groups have cautioned against any hasty return before peace and stability is restored.
A spokesman for Burmese leader Aung San Suu Kyi confirmed that the two journalists had been arrested.
The aid agency's death toll far surpasses estimates from Myanmar's government, which has put the figure in the hundreds. She said that U.S. Ambassador Scot Marciel on Wednesday had a conversation with two government officials in Burma who seemed "genuinely unaware" of the situation.
The Rohingya, described by the U.N.as the world's most persecuted people that have faced heightened fears of attacks since dozens were killed in communal violence in 2012.
The International Committee of the Red Cross reports that life has stopped in its tracks in Rakhine state where an estimated 180,000 Rohingya remain, fearful of further violence.
Reported byBenarNews, an RFA-affiliated online news service.
There will be no end to the cycles of conflict and displacement in Rakhine State without addressing the main drivers and the roots of this conflict, the statement said.