Riot police backed by helicopters and water cannons broke up a sit-down strike by union workers Tuesday at an auto parts plant in South Korea, media there reported.

The strike at the Yoosung Enterprise factory in Asan threatens to cripple production at Hyundai, Kia, GM and Renault plants in South Korea, The Korea Times reported.

Hyundai and Kia get 70% of their engine components from Yoosung, according to the Korea Times.

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