Authorities in Mauritius have arrested the Indian captain and chief officer of the capesize bulker responsible for what is being called the country's worst-ever environmental disaster.

Sunil Kumar Nandeshwar, the 58-year-old Indian man in charge of the 203,000-dwt Wakashio (built 1997), has been charged with endangering safe navigation, the BBC reported citing police.

Owner Nagashiki Shipping confirmed the master and chief officer had been arrested by the local authority on 18 August.