A man inspects a car damaged in overnight protests in Iran against plans to ration fuel for private vehicles.
Several petrol stations in the capital, Tehran, were attacked over the rationing plans.
Demonstrators were angry that little warning had been given before the rationing took effect.
Slogans attacking President Mahmoud Ahmadinejad were heard in the first large, violent protests against him since his election in 2005.
The rationing is said to have been prompted by fears that the West may restrict imports of the refined fuel on which Iran depends.
Though it lacks refining capacity, Iran has large fuel reserves and many Iranians will resent curbs on their consumption, our correspondent says.