Authorities say Thai tour boat involved in fatal collision off Phi Phi was carrying drugs when incident occurred

The boat's three crewmembers and 21 other passengers suffered injuries, though none were life-threatening.

The trawler meanwhile suffered no damage and no pollution was detected in the surrounding waters.

The tour boat's passengers at the time of the collision included UK, Polish, Russian, Kazakhstani, Kyrgyzstani and Uzbek nationals.