An act of deliberate poisoning has been suspected following the deaths of over 500 fish at a public aquarium in northern Malaysia.
A large section of Langkawi Underwater World has been closed as a police investigation gets underway.
It is believed that sharks, stingrays and groupers were among the species to have died in the incident, which focused on the aquarium's 1.3 million-gallon, 50-foot-long walkthrough marine tank.
Police are currently awaiting the results of a water analysis before it can be determined exactly what happened, however Super Intendent Mohamed Ali Jamaludin told The Associated Press that the water did smell of gasoline.
This is not a work of negligence, the police chief said. The police are confident that a pesticide or poison was involved, and it is believed to have been a sabotage attack against the aquarium.
The rest of the centre has remained open, although only a fraction of the average 1000 daily visitors have visited following the incident.
The aquarium is currently offering a US $2,900 reward for information regarding the incident that leads to an arrest.