Mexicans opposed to reform of the country's state-run oil industry have been protesting for months. They say reform would amount to a giveaway to private transnational firms - in particular US companies.
But the ruling PRI party and its business-friendly ally, the National Action Party, say Pemex is a moribund company that needs a major overhaul.
Al Jazeera's Adam Raney reports from Mexico City.
Source: Al Jazeera