Three Libyans killed a Nigerian man by setting him on fire in Tripoli, the interior ministry said on Wednesday, in what a U.N. agency described as “another senseless crime against migrants in the country”.

The Tripoli-based interior ministry said in a statement it had arrested the three suspects in the case, adding that they had used petrol to set the victim on fire at a factory.

Federico Soda, Libya country chief for the International Organisation for Migration (IOM), a U.N. migration agency, said those responsible must be held accountable.