Gunfights and blockades of burning vehicles have been reported in the Mexican border city of Reynosa.
The US consulate in Matamoros said in a message on Friday that it had "learned of several firefights and roadblocks throughout the city of Reynosa," and it recommended that US citizens take precautions.
The city government posted a warning on its Twitter site recommending motorists avoid several areas, including the highway to the nearby city of Matamoros.
A Mexican federal official who was not authorised to be quoted by name confirmed the burning of vehicles, roadblocks and shootouts.
But he could not immediately confirm reports a top member of the Gulf drug cartel had been detained.
Warring factions of the Gulf cartel have been fighting turf battles around Reynosa and Matamoros.
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