casey stiegal has been following this from our dallas newsroom.lse wereuj5p learning abt the students. >> frankly, some very disturbing information about a potential crime scene because one of the suspects, not the mayor or his wife that you mentioned, someone much lower on the totem pole, reportly bragged to police how all 43 of the students were marched to land phil, ordered to dig their own grave, murdered, and then their bodies were burned in a 14-hour bonfire. the charred remains being tested for dna by forensic scientists in austria with hopes of identifying them. the protests are growing more and more violent as parent office the kids and other citizens demand answers from the mexican government. many believe that students are still alive somewhere, perhaps the conspiracy theory. mexico's interior minister says authorities will redouble search efforts and says this investigation is still open and ongoing. >> we showed the pictures of the parents at the airport. they obviously good there bus they want outsiders to see this and get some noti