Shooting broke out at a checkpoint outside the US embassy in Yemen today, but Yemeni officials gave different accounts of the incident.
One official said it appeared to have been security forces firing in the air to warn an approaching car.
"Three people who were in the car are being questioned," the security official said. "It does not seem that they had shot at the checkpoint."
Another security official said gunmen in the car had opened fire at the checkpoint, hours after the mission said it received a threat.
Twin suicide car bombings killed 16 people outside the heavily fortified US embassy in Sanaa in September, in an attack later claimed by al-Qaeda.
The embassy had earlier urged Americans to be cautious in the Arab country that has been the scene of al-Qaeda attacks on Western interests.
Reuters