Mexico City, October 25 (RHC-PL) -- The Office of the UN High Commissioner for Human Rights urged the national authorities Friday to step up efforts to find the 43 students missing from the Normal Rural School of Ayotzinapa, in Iguala, Guerrero state.

"We lament that the mechanisms to find the missing students have not been successful so far, and we urge the authorities to increase their efforts to find them," said the UN in a press release.

The UN office made emphasis on its concern "because the forced disappearance of 43 students continues in Iguala municipality," adds the text, which acknowledges that President Enrique Pena Nieto "has deplored" the events that on September 26-27 resulted in six people killed, about twenty wounded and 43 missing in that locality of Guerrero, but also says that the UN is worried because of the finding of another nine clandestine mass graves in Iguala.

"We urge the Mexican authorities to conduct effective, prompt and impartial investigations to identify the bodies in the clandestine graves and bring those responsible to justice," says the text.