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Police told local media that Deya died on the spot on Tuesday evening after his vehicle was involved in an accident with a university bus and another vehicle near Kisumu town in western Kenya.

"My son died like an animal," said Meshack Ojwang, before breaking down in tears in front of journalists outside Central Police Station in Kenya's capital, Nairobi.

He was picked up in neighbouring Kenya, taken across the border and then charged in a military court with possession of pistols and attempting to purchase weapons abroad, which he denied.

"If we have a protracted situation where this is what we can manage, then basically we have a slowly starving population," says Felix Okech, the WFP's head of refugee operations in Kenya.

Kenya's independent police oversight body has launched an investigation into the death of a man who had been detained "for false publication", police have said.