More than 1,000 migrants have died in the Mediterranean Sea this year, the sixth year in a row that that "bleak milestone" has been reached, the United Nations refugee agency says.

"UNHCR is urgently calling for an increase in search and rescue capacity, including a return of EU state vessels to search and rescue operations, and an acknowledgement of the crucial role of NGO boats in saving lives at sea," UNHCR spokesman Charlie Yaxley said in a statement on Tuesday.
At least 15,000 people have lost their lives in Mediterranean crossings since 2014, the UN's International Organization for Migration (IOM) said.