HARBEL, Liberia: Striking workers at the Firestone Rubber plantation in the West African nation of Liberia clashed with police Friday, and at least six people were wounded, officials said.

Between 6,000 and 8,000 workers at the plantation, which is run by a subsidiary of Japan-based tire giant Bridgestone Corp. and is Liberia’s largest employer, have been striking since Tuesday. They are demanding the removal of a top manager, Labor Minister Kofi Woods said.

The Firestone plantation offers one of the few steady jobs for unskilled laborers in war-recovering Liberia. The West African nation emerged from more than a decade of civil war in 2003 and has had a democratically elected government in place for just over a year.

On Friday, striking workers set up roadblocks and threw rocks at a force of Liberian police and United Nations peacekeepers called to the site to disperse the crowd, police Chief Munah Sieh said. She said police released tear gas into the crowd and fighting broke out. Sieh said three of the six wounded were police officers.

One of the injured, 50-year-old worker Anthony Saah, said he was attacked by police.

“I was not involved in the riot. The police rushed on me and said I was one of those throwing stones; they hit me with sticks on my head,” he said. Saah was waiting to be treated at a hospital for head wounds.

About a dozen people were arrested and charged with rioting, Sieh said.

The strike started as company and government officials met in the capital, Monrovia, to review the contract that allows Firestone to operate on the 200-square-mile (500-square-kilometer) tract of land.

Worker spokesman Rancy Barco said the manager they were demanding be fired had tried to undermine the union. He did not provide further details.

Firestone has been operating in Liberia since 1926. The company’s concession agreement was re-negotiated under the country’s two-year transition government, but is being reviewed again by the new administration.