Mystery surrounds deaths of 500 dolphins washed up in Peru

At least 500 dolphins have washed up dead on different beaches in northern Peru in the past few weeks.

Mystery surrounds their deaths and investigations are on going.
Experts from the Peruvian Sea Institute who were looking into the beaching of around 100 dolphins in recent weeks then found an additional 400 spread across an 88 mile stretch of coastline.

Reports state that local fishermen told the investigating team that the dolphins were caught in fishing nets and drowned, but scientists have confirmed  that some young and adult dolphins died at sea and others were still alive when they beached on the shore.