In pictures: Riots in Venezuela

Venezuelan troops have used tear gas in Caracas to disperse thousands of students opposed to President Hugo Chavez.

The protesters - many of whom threw stones at police - were demonstrating against a series of proposed constitutional reforms.

The students are demanding the postponement of a referendum on the changes, which include a measure to allow Mr Chavez to stand for election indefinitely.

Authorities broke up the protest outside the headquarters of the country's electoral council.

Police also used water-cannons to disperse the protesters, many of whom had taken part in a similar rally on 24 October.

Despite the often heated confrontations between the protesters and the police, there have been no reports of serious injuries.

President Chavez's police force will remain on high alert until December, when the referendum on his proposals is set to take place.

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