article_snippet: security forces since Mexican President Enrique Pena Nieto took .
article_snippet: office in December 2012.
article_snippet: It is the deadliest attack on the forces since Mexican President Enrique Pena Nieto took office .
article_snippet: Bringing peace to Mexico was President Enrique Pena Nieto's .
article_snippet: first promise when President Enrique Pena Nieto took office in 2012.