Carel Aaron Van Der Merwe immigrated to US at 14 and has been waiting seven years for asylum case to be heard

A Wisconsin state patrol trooper, whom federal immigration agents detained on Thursday at an airport, has been released from their custody.

Immigration and Customs Enforcement (ICE) agents approached Carel Aaron Van Der Merwe, a South African national, as he waited to board a domestic flight, according to his law firm Christopher & De León.