Analysts say attacks on diplomatic personnel are rare in Mexico.
Two people employed at the US embassy in Mexico have been wounded after their car was mistakenly fired on by police south of Mexico city, officials say.
The Mexican Navy said the US personnel were on a main road to the city of Cuernavaca when the shooting happened.
August 24, 2012
BBC
Details are still unclear, but the navy said the US vehicle had been fleeing from gunmen in another car.
The US state department said it was working with Mexican authorities to investigate the incident.
Spokeswoman Victoria Nuland said the two men were receiving "appropriate medical care and are in stable condition".
"We have no further information to share at this time," she added.
One of the men was said to have been hit in the leg and the other in the stomach and hand. Both were admitted to hospital.
The Mexican public security ministry and marines said in a statement: "Today at 08:00 a diplomatic vehicle belonging to the US embassy was hit by multiple bullets from personnel of the federal police in the Tres Marias-Huitzilac highway."
It said the embassy personnel had been heading to a military installation when a carload of gunmen opened fire on them and chased them, along with a Mexican naval officer accompanying them.
Alerted to the gunfire, a federal police patrol vehicle came to the scene and apparently opened fire.
The federal police officers involved have been held for questioning, the navy said.
Pictures from the scene showed the Toyota vehicle riddled with bullet-holes.
The shooting happened in an area where drug gangs and leftist rebels have been known to operate in the past.
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