Authorities haven't revealed the targets of the investigation or its exact nature, other than to say it involves activities concerning the material support of terrorism.
Mexican author and guerrilla movement scholar Carlos Montemayor died Sunday, his publisher said. He was 62.
A historian and linguist whose academic work centered on indigenous culture and rebels, Montemayor was sympathetic to the armed Zapatista uprising in 1994 in the southern state of Chiapas.
