Hooded protesters are clashing with police ahead of a nationwide student demonstration in Chile.

Local Radio Cooperativa reports that protesters have thrown Molotov cocktails at a police station in Santiago. They've also barricaded roads and burned tires, blocking rush hour traffic along some of the capital's main roads.

Teachers, dock workers and copper miners say they will join students in Wednesday's national protest to demand education reform.

The march is timed ahead of Sunday's presidential primaries to raise awareness about Chile's vast income inequality and the need for educational reforms.

Chilean student protests are often infiltrated by violent anarchist groups who throw rocks and firebombs. Police in riot gear respond with water cannons and tear gas.