Strikers at Namibia’s largest zinc mine are accusing the owners of trying to intimidate them by bringing in police.

Michaeleno Kadhikwa, a local Mineworkers Union of Namibia leader, told The Associated Press Wednesday it was unnecessary to bring in police, who have been at the Skorpion Zinc mine since Tuesday.

Kadhikwa says strikers have tried to keep temporary workers from taking their jobs, but the strike has been peaceful.

Skorpion’s spokesman, Usi Hoebeb, refused comment.

The union wants 14 percent pay increases and housing, transport and overtime allowances. Mine owner Anglo Base Metals has offered a 10 percent increase and no allowances.

The mine employs about 1,200 workers, and produces 150,000 tons of special high grade zinc.