Mexico City, August 27 (teleSUR-RHC)-- Relatives of the 43 forcibly disappeared Ayotzinapa students, along with supporters, held a peaceful rally Wednesday in the Mexican capital. They had traveled from other states to continue to demand justice for their missing children, 11 months after the disappearance. However, activists say police violently repressed demonstrators in Mexico City's central square after the event concluded. “After the end of the march... riot police, sent by the Mexico City government and other individuals in suits arrested two guys with great violence ... there were blows to the people that were there, and they went into the subway station to find more, one-by-one, to literally rip from hands of observers, they would surround people while others with shields and batons would deliver blows left and right,” witness Ana Elena Contreras told Guerrilla Communication Mexico. Photos on social media showed various people with serious injuries that they allege came at the hands of police. A video shows police acting with little regard to the safety of a woman with a child in her arms. One testimony claims relatives of the missing students, who had earlier participated in the rally, were among those attacked by police attack inside the Zocalo subway station. According to witnesses, police detained several individuals inside the subway station, but they later reappeared in the plaza above with injuries alleged sustained from the police. The experts, known as the International Group of Independent Experts or GIEI, is due to turn in their report at the beginning of September after six months of inquiry. The GIEI has asked for its initial mandate to be extended. An extension requires the support of the Mexican state and the Inter-American Human Rights Commission, which monitors GIEI’s work. According to Proceso, Interior Minister Miguel Angel Osorio Chong told the relatives that he would extend the group's mandate, but as of yet has made no official announcement. The Mexican government has come under heavy scrutiny over its human rights record. The relationship between the GIEI and the Mexican state has been contentious. Experts with the GIEI have complained that officials have not been forthcoming with information and that they have been left unsatisfied with the information provided, when they were provided, in nearly half of their inquiries.