The UN has accused Buddhist-majority Myanmar, also known as Burma, of driving the Muslim minority over the border in an ethnic cleansing campaign, but the country has denied the charges.
Almost 700,000 Rohingya have fled the area since last August, carrying stories of atrocities at the hands of troops and vigilante groups in the Buddhist-majority country.
The killings of 10 Rohingya men occurred in the village of Inn Din in September past year and the bodies were buried in a mass grave after they were hacked to death or shot and killed by Buddhist neighbours and Myanmar soldiers.
"The Reuters investigation of the Inn Din massacre was what prompted Myanmar police authorities to arrest two of the news agency's reporters", the report said.
The United Nations on Friday described the details of the Reuters report as "alarming" and joined the United States in calling for an investigation into the violence in the state.
"This once more attests to the need for a full and thorough investigation by the authorities of all violence in Rakhine State and attacks on the various communities there", United Nations spokesman Farhan Haq told reporters in NY.
Johnson is scheduled to visit Rakhine later today.
Paet said that the European Union, member state and the global public must also increase their financial and material contribution to help the Rohingya refugees.
On Jan 10, the military said the 10 Rohingya men belonged to a group of 200 "terrorists" who had attacked security forces.
The Reuters report said witnesses denied there had been any major attack from Rohingya militants before the alleged massacre.
Britain's foreign minister Boris Johnson has met Myanmar's de facto leader Aung San Suu Kyi to press for action on the Rohingya crisis where troops are accused of atrocities against the Muslim minority in Rakhine state.
Two Reuters journalists now in detention in Myanmar were arrested by authorities there because they were investigating a mass execution of minority Rohingya Muslims in the country's Rakhine state, the news agency has said.
More than 600,000 men, women and children are estimated to have fled to neighbouring Bangladesh following persecution from the Burmese military in their native state of Rakhine, which began in August.