The deaths of hundreds of migrants in the Mediterranean is a "man-made tragedy that could well have been avoided", Amnesty International say.
As many as 700 migrants are feared to have drowned after their boat capsized off the coast of Libya on Sunday.
“What we are witnessing in the Mediterranean is a man-made tragedy of appalling proportions. These latest deaths at sea come as a shock, but not a surprise,” said John Dalhuisen, Amnesty International’s Director for Europe and Central Asia.
Save the Children also joined calls for action, saying European leaders could no longer "look the other way while thousands die".
Justin Forsyth, the charity's chief executive, said a "crisis summit" was needed within 48 hours.
Mohammed Ali Malek, presumed captain of this weekend's sunken migrant ship, showed little emotion as he appeared in court today.
As the politicians meet, a people smuggler scorned their efforts. The man insists he is helping desperate people out of dire situations.
Abdel Rahim Ali says his journey from Africa to Europe was fraught with hunger, incarceration and the regular threat of death.