More arrests have been made in the case of those 43 students who went missing at the end of September in Iguala, Mexico.

The latest is a former top police official who's a suspected member of Guerreros Unidos. That's the drug cartel that's been at the center of this case.

The arrest follows a mass march last week. Protesters want answers about the students - all young men - who disappeared almost two months ago.

Ruben Martinez is a professor of literature and writing at Loyola Marymount University.

He was at the demonstration in Mexico City and joins Take Two.