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The Belgian teens had entered Kenya on a tourist visa and were staying in Naivasha, a town popular with tourists for its animal parks and lakes.

"Don't overstay your visa. Don't stay too long," he said.

Ms Senait had arrived by plane in Kenya's capital, Nairobi, on a tourist visa with her two younger children, fleeing religious persecution.

In the weeks since, both sides had taken tit-for-tat measures against each other - including expelling diplomats, suspending visas and closing border crossings.

Known as the double contribution convention, this means people on short-term visas will not make social security payments in both the country they work in, and their home country, when working abroad.