SEOUL, South Korea (CNN) -- A strike that has paralyzed a South Korean auto plant since May evolved into a standoff with police this week.
The standoff at the Ssangyong Motor Company factory entered its fourth day Thursday, with no new reports of injuries.
Riot police armed with stun guns entered the factory on Monday to rout out workers who have staged a sit-in since May 22. opposing a layoff plan.
Workers fired nuts and bolts at police with slingshots, wounding 17 officers, authorities said. Ten of those injuries occurred Wednesday.
Debt-stricken Ssangyong Motor is the country's fifth-largest automaker. As part of a restructuring plan to emerge from bankruptcy, the company said it will lay off 2,646 workers -- 36 percent of its workforce.
An additional 1,670 have left voluntarily.
Journalist Jennifer Chang contributed to this report.