Reports from Algeria say two farmers were killed and another two wounded when their tractor hit a bomb in the west of the country.

The bomb had been planted by the roadside in Chlef Provincea-hundred-and-fifty kilometres west of the capital, Algiers.

A similar device wounded more than forty passengers on a bus on Monday near the town of Medea, south of Algiers.

Algeria has been racked by violence for the past six years, after the authorities cancelled a general election which an Islamic group was poised to win.