GENEVA: Libya was urged at a UN meeting on Tuesday to close detention centers where rights groups say migrants and refugees have been tortured, abused and sometimes killed. Multiple states including Britain, Spain, Norway and Sierra Leone raised concerns at the meeting in Geneva about treatment of migrants in Libya, a major transit route for Africans fleeing conflict and poverty toward Europe. Some of them have been held in warehouses by traffickers where they have been subject to violence and extortion, according to a Dutch court case.