Mexico’s authorities arrest Astudillo, a gang leader who they say is the leader of a drug cartel and who is a key figure in the disappearance of 43 students last year in a town in one of the country’s states. He is alleged to have given the orders to abduct and kill the students because he thought they were members of a rival gang. After having the students murdered, Astudillo then had the bodies disposed of by burning them at a rubbish dump outside the city. There have so far been 111 arrests over the disappearances. International experts have disputed the government’s accounts of what happened and have said its investigation was deeply flawed.