Authorities in Austria now say the bodies of as many as 70 people have been found inside an abandoned refrigerated lorry.
There are reports three people have been arrested in Hungary after the discovery on a motorway.
It comes as 200 migrants are feared to have died after an overcrowded boat capsized off Libya.
Lindsey Hilsum, Channel 4 News International Editor, says European countries have to start accepting more refugees – and process them in a humane way.