About 115 people are missing feared drowned and another 134 were rescued by Libyan coast guards and local fishermen after a wooden boat carrying migrants capsized off Libya, a Libyan navy official said.
The UN refugee agency UNHCR said up to 150 people were feared dead.
“The worst Mediterranean tragedy of this year has just occurred,” UNHCR head Filippo Grandi said in a tweet.
There were about 250 people on board, mainly from Eritrea and other sub-Saharan Africa and Arab countries, when the boat capsized near Komas, east of Tripoli, Libyan navy spokesman Ayoub Qassem said.
The latest shipwreck takes the death toll of Mediterranean migrants to over 600 this year, putting 2019 on track to be the sixth year in a row with more than 1,000 deaths, UNHCR spokesman Charlie Yaxley said.
“Until we address why people take these dangerous boat journeys, sadly, this is unlikely to be the last tragedy we see,” he said.
Yaxley said survivors were likely to be brought to detention centres in Libya where they would face further risks and he called for their immediate release.
“We know inside the detention centres there’s insufficient food, water, often unsanitary conditions. There have been widespread reports of human rights violations,” he said.
Libya says migrants are illegally entering and leaving the country. It detains them in centres the UN says are effectively jails, exposing them to the added risk of being caught up in the country’s civil war.
One detention centre in Tripoli was hit by an air strike earlier this month, killing more than 50. UNHCR subsequently said it was closed, but rescued migrants continue to be sent there.
Human rights activists accuse politicians in the European Union of turning a blind eye and letting people die rather than risk a voter backlash by appearing soft on immigration. Europe struggled to cope with an influx of more than a million refugees and migrants in 2015.
Italy, many African migrants’ intended first destination, has taken a tough line since a populist government took office in 2018 and sought to close the nation’s ports to rescued migrants.