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The massive march was sparked by outrage over the government's slow response to the island nation's worst environmental disaster in years.
Thousands of civilian volunteers have worked for days to try to minimize damage to protected marine wetlands polluted by the spilled fuel.
Locals are donning hazmat suits and trying to clean up the oil spill after the MV Wakashio struck a coral reef and ran aground.
An estimated 1 ton of oil has already escaped into the Indian Ocean after a Japanese ship ran aground off the island's southeast coast.
WHAT'S HAPPENING
Be a traveler, not a tourist.
The plane disappeared in March 2014 with 239 passengers and crew on board.
A device suspected to be a bomb was found in the aircraft's lavatory.