Mexican police arrested one of the senior police officers accused of involvement in the disappearance of a group of 43 student teachers last year, the country's interior ministry said on Thursday.
Armed men attacked a Mexican army helicopter on Friday, killing three on board and forcing it to the ground on a day of violence that left at least seven people dead and vehicles, banks and gas stations ablaze.
Mexico's Congress has approved an anti-corruption law that could help relieve pressure on President Enrique Pena Nieto's scandal-plagued government.
Mexico's government said on Monday it would investigate reports that federal police killed 16 unarmed people in two attacks in January, the latest allegations to raise the specter of abuses by Mexican security forces.
