Because Sana could be the first big city in the world to run out of water, within a decade.

I. A. have quietly bulked up the number of their operatives at the embassy in Sana, the Yemeni capital, over the past year.

Britain said the car was on its way to the embassy in Sana'a with five staff on board, one of whom suffered minor injuries.

In the other incident, officials say a security guard shot and killed the Frenchman inside a compound of Austrian oil and gas company OMV near Sana'a.

He said one reason why the U.S. embassy in Yemen's capital Sanaa reopened Tuesday after a security scare was to resume processing visa applications from Yemeni travelers.