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Felipe Calderon, Mexico's president, has warned that the country's drug war is entering a new phase as gangs increasingly target journalists who cover the violence.

His warning follows the release of four journalists kidnapped by a cartel in northern Mexico last week.

Their release is a rare fate for most abducted journalists in the country, where many have been killed by drug cartels and others remain missing.

Al Jazeera's Mariana Sanchez has more on what some journalists see as an attack on the country's media as a whole.

Source: Al Jazeera