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MEXICO CITY (AP) — The Mexican Navy says marines were involved in three shootouts in the border city of Reynosa that killed two suspected gunmen, but said that they were not involved in a fourth shooting that injured two civilians.

El Manana newspaper reported the two wounded civilians were U.S. citizens. Reynosa is across the border from McAllen, Texas.

The U.S. Embassy in Mexico City said it was aware of reports of “a shooting incident involving a U.S citizen near the border” but did not confirm the victims’ nationalities because of privacy considerations.

Navy officials said Wednesday that marines came under fire at three points in the city. Marines returned fire in the third incident and killed two armed people in a vehicle.

Reynosa has long been dominated by the Gulf drug cartel.

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