SPANISH police are investigating a potential massacre onboard a migrant boat - with disturbing reports of executions and people throwing themselves into the sea.

Around 320 people were on the wooden "cayuco" canoe when it left West Africa, but only 251 made it to the Canary Islands - leaving 70 lost along the way.

Judicial sources confirmed to Spanish news agency EFE that some of the deaths were being investigated as murder, after survivors told of deliberate executions.

A small group of passengers accused some of their boatmates of witchcraft, shot them and dumped their bodies into the Atlantic, according to unconfirmed reports in OKDiario .

Cops are said to be seeking up to 30 men in migrant shelters across the Canary Islands in their investigation.

Other passengers are said to ha

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