MILAN — Rescue crews searched Monday for survivors and bodies from what could be the Mediterranean’s deadliest migrant tragedy ever as hundreds more migrants took to the sea undeterred and EU foreign ministers gathered for an emergency meeting to address the crisis.

If reports of at least 700 and as many as 900 dead are confirmed, the weekend shipwreck near the Libyan coast would bring to well over 1,000 the number of migrants who died or went missing during the perilous Mediterranean crossing in the last week. More than 400 are feared dead in another sinking. More than 10,000 others were rescued.

Libya is a transit point for migrants fleeing conflict, repression and poverty in countries such as Eritrea, Niger, Syria, Iraq and Somalia.

A new tragedy unfolded in Greece, meanwhile, where search and rescue operations were under way today after a wooden boat carrying dozens of migrants who departed Turkey ran aground off the eastern Aegean island of Rhodes. At least three people, including a child, were dead, while 93 were rescued.