Myanmar
In 1 April 2012 by-elections the NLD won 43 of the 45 available seats; previously an illegal organisation, the NLD had never won a Burmese election until this time. The 2012 by-elections were also the first time that international representatives were allowed to monitor the voting process in Myanmar. Following announcement of the by-elections, the Freedom House organisation raised concerns about "reports of fraud and harassment in the lead up to elections, including the March 23 deportation of Somsri Hananuntasuk, executive director of the Asian Network for Free Elections (ANFREL), a regional network of civil society organisations promoting democratization." However, uncertainties exist as some other political prisoners have not been released and clashes between Burmese troops and local insurgent groups continue.

Q: Who raised concerns of fraud in the elections held in the Burma 2012 elections ?
the Freedom House organisation raised concerns