The third strike in four weeks affected Honda Motor Chinese suppliers on Wednesday, and that has raised concern that unrest among workers in the ‘workshop of the world’ is spreading.

Honda told Reuters a strike and production stoppage had begun on Wednesday at a factory in Guangdong province that supplies locks to all four of the automakers’ factories in China.

But work resumed at a factory supplying exhaust systems Honda unit Yutaka Giken said.

Honda spokesman Yoshiyuki Kuroda said the automaker expected no disruption so far from Wednesday’s stoppage at Honda Lock’s factory, with sufficient stock on hand for now.

But the three-day strike at the exhaust systems plant majority owned by Yutaka Giken would keep both car factories operated by joint venture Guangqi Honda, which builds the Accord, Fit/Jazz and two other models, idled on Thursday, he added.

That strike started on Monday, just days after Honda settled a strike at a wholly owned transmission supplier that had forced it to halt all output in China.

Workers at the exhaust plant had wanted higher pay, compensation for having to shut down for about a week due to disruptions at other plants, and were awaiting a quarterly bonus due last March.

The strikes were re certain to affect costs for carmakers in China, auto analyst Koji Endo said.

“Foreign firms would have to raise salaries due to severe labour shortage especially around Guangdong, where plants of foreign automakers and electronics makers are concentrated,” he said.