Police in Algeria's capital have used teargas to disperse a crowd of young men who threw stones and petrol bombs to try to stop bulldozers demolishing dozens of illegally built homes. Wednesday's (23 March) riot was unusually violent and took place at a time when Algerian authorities are wary of any sign of contagion from the unrest elsewhere in the Arab world. A police spokesman said 50 officers were injured in the clashes. Reporters on the spot said the demonstrators replied with iron bars and stones.