New Delhi - Police imposed a curfew in the northern Indian city of Agra, home to the country's most popular tourist attraction, the Taj Mahal, after a fatal road accident early Wednesday morning fueled violent clashes on the streets.

The curfew meant that the famed monument to love, which sees an average of 8,000 tourists each day, was off limits. Police did not say when the curfew would be lifted. They advised tourists not to leave their hotels.

The clashes erupted after a truck ran over and killed four young men riding a motorcycle early Wednesday, when large numbers of Muslims were out observing the festival of Shab-e- Barat, visiting graveyards of their kin and praying for forgiveness. A crowd chased the truck and set it on fire, according to the local police.

The crowds swelled. Other vehicles were burned, including a firetruck, and clashes with the police broke out. One person was killed. All told, 25 people, including firemen and policemen, were injured, according to Sita Ram Meena, the state's most senior government official in charge of Agra.

Local authorities suggested that the truck was not supposed to have entered the road where the people observing Shab-e-Barat were gathered.

Police said they told tourists staying in the city to avoid going outside, unless escorted by law enforcement officials.