The ambush, and the earlier discovery of an opium poppy plantation in a nearby town, suggested that drug cartel violence may be moving ever closer to the nation's capital.
The marines were on patrol in the township of Luvianos when gunmen opened fire on the troops in the main square of an outlying hamlet from the roof of a building and from a moving vehicle.
The two wounded marines are in stable condition.
Earlier, the navy said marines found and destroyed a 6-acre (2.4-hectare) opium poppy plantation even closer to the capital. The field was found in the State of Mexico about 80 kilometers (50 miles) from Mexico City, near the Nevado de Toluca volcano.
The navy said in a statement late Monday that it found the field over the weekend, after receiving tips that a gang was guarding drug plots in the area. It said an estimated 221,000 poppy plants were destroyed in the raid.
It is unusual to find such a large plot so close to the capital. The navy did not say what gang or drug cartel was suspected of planting the poppies, but said a campsite was found nearby.
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