In the southwestern Mexican state of Guerrero, public opinion and social organizations are deeply concerned and angered over Wednesday's police attack on Ayotzinapa students. The brutal attack, video of which was filmed by the students, left 8 students seriously injured and hospitalized. Critics say the attack is part of a strategy by the state government, now in the hands of the ruling Institutional Revolutionary Party, to discredit the students and criminalize their protests. Clayton Conn reports from Mexico City.