Another boat sank off the Greek island of Crete
More than 100 bodies have been recovered from the sea after a boat carrying migrants capsized off the coast of Libya.
Libya's navy spokesman, Colonel Ayoub Gassim, said at least 104 bodies had been pulled from the water near the western city of Zwara.
The death toll is expected to rise, because the type of boat used often carries up to 125 people.
Coast guards found the empty vessel on Thursday. They say it is possible that it capsized on Wednesday.
Meanwhile another boat has sunk about 75 nautical miles south of the Greek island of Crete.
Four bodies have been recovered so far.
Another 340 people are said to have been rescued, with many more feared missing.
"The information we have on the number of people on board the vessel is still unclear - we've heard that there were 400 or 500 people on board, but we cannot confirm that number," Greek Coast Guard spokesman Nikos Lagadianos said.
"There is a huge rescue effort underway".
Greece has sent two patrol vessels, a military plane and three helicopters.
Five passing ships have also been participating in the rescue operation.
The authorities in southern Crete are trying to secure temporary shelter, should some of the survivors be taken there.
Warmer weather and calmer seas recently have led to a surge in the number of people trying to reach Europe from Africa.