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A team from the Zanzibar-based University of Dar es Salaam's Institute of Marine Sciences said a preliminary investigation into the mass stranding of nearly 600 bottlenose dolphins had failed to yield an explanation.

"We have net yet been able to determine what has exactly caused the
strandings," it said in a report. "We are still doing more
investigation and ... in a few weeks' time we may come out with some
answers."

As of Tuesday, researchers said about 540 of the dead mammals, which
washed ashore on four beaches on semi-autonomous Zanzibar's main island
of Unguja on Thursday and Friday, had been buried, but that other
carcasses could be found.

Analyses of samples taken from the dolphins revealed that their
stomachs were all unusally empty, suggesting they vomited in a confused
or frenzied state although residue showed they were not poisoned.

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