THE Biyagama free trade zone has been rocked by labour unrest for the second time in two weeks.
In the latest incident on Monday, thousands of workers belonging to eight factories locked in their management staff after their demand for a wage increase had been turned down.
The incarcerated staff included 50 South Korean nationals, according to police.
At least 15 demonstrating employees were injured after riot police moved in to end the siege.
The unrest began on Monday afternoon after the workers locked the factory gates and launched a sit-in protest. Executives and management staff were prevented from leaving.
Police stormed the site and were compelled to fire tear-gas and baton charge the workers, who had become unruly.
A bus and three cars belonging to factory executives were damaged in the clash.
