Nearly 500 migrants who tried to cross the central Mediterranean have been brought back to Libya, according to a UN spokesman, two days after charity groups lost contact with the boat carrying them, Reuters reported. “Libya is an unsafe port where migrants should never be brought back,” Flavio Di Giacomo, a spokesman for the UN’s International Organisation for Migration wrote on Twitter. He told Reuters there were 485 migrants and they docked in the Libyan port of Benghazi on Friday. Alarm Phone, a group that picks up calls from migrant vessels in distress, had no signs from the boat since Wednesday morning. The Italian Coast Guard reported on Thursday the rescue of 423 and 671 migrants in two separate operations in Italian search and rescue waters, and Alarm Phone said they were unrelated to the missing boat.