Deadly earthquakes in recent days have forced major Japanese companies to partially shut down operations.
Toyota, the world's largest automaker by sales, is experiencing a parts shortage and is suspending production on a number of its vehicle assembly lines across Japan this week.
Honda halted operations at a motorcycle factory in Kumamoto, where the most powerful earthquake struck.
The two strongest quakes hit on Thursday and Saturday, killing dozens of people and damaging thousands of buildings.
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