Jakarta – Around 8,000 workers at two Indonesian factories producing Nike shoes went on a violent rampage in protest at dragging negotiations over bonuses, a report said Thursday.

The workers from the PT Astra's Shoe Industry Division in Tanggerang, west of Jakarta, on Wednesday vandalized seven vehicles inside the factory compound and smashed factory windows with stones.

"We want larger holiday bonuses and the 10 percent tax imposed on the bonuses to be cancelled," an employee was quoted by the Jakarta Post daily as saying. Holiday bonuses of one month salary are usually given every year prior to the Christian Christmas and Muslim Eid-al-Fitr holidays.

The demonstrators also demanded the democratic election of a new labour union leader for the workers of the company. "The current union caretakers are not able to voice our aspirations. We also want the company's chief of staff to resign bercause he has failed to carry out his job properly," one of the employees said.

An official at the Indonesian manpower ministry was monitoring the negotiations between the company owners and the workers.