Although migrant apprehensions at the US-Mexican border decreased in 2017, the number of people who died while making the crossing remained high, the UN Migration Agency (IOM) reports.

Data published this week by its Missing Migrants Project puts the death toll at 412 last year, compared to 398 in 2016.

Dianne Penn has been speaking to Joel Millman, an IOM spokesperson based in Geneva.

He explains how changes in smuggling routes and in weather conditions have contributed to these tragedies.