Rescue crews are searching for survivors and bodies from what could be the deadliest migrant tragedy ever in the Mediterranean.

There are reports as many as 900 died in the shipwreck near the Libyan coast over the weekend and at least 400 are feared dead in another sinking.

Search and rescue operations are underway near Greece, after a wooden boat carrying migrants from Turkey ran aground.

Italy’s premier says ships are responding to a pair of migrant emergencies near the Libyan coast.