Executives of a Japanese company made basic concessions to the demands of their labor force on Tuesday, after outraged workers trapped management staff, including 10 Japanese, in their offices when protesting against new regulations last week.

Eighteen management staff were stopped from leaving their offices by about 1,000 workers at Shanghai Shinmei Electric on Friday morning, and were not released until Saturday night when police managed to break through the crowd.

The company, which supplies switches and other components to electronics giants such as Sony, Sharp and Nokia, said it scrapped the proposed regulation that prompted the protest, and promised a pay raise.