The crisis appears to be stoked by the leader of Belarus over the country's tensions with the bloc. Polish border guards have used water cannons and tear gas to turn back stone-throwing migrants.
Rights groups accuse nations of using COVID-19 as an excuse to shut out refugees. Here's one story of migrants attempting a deadly voyage to Europe, only to be pushed back to where they fled.
Total migration to Europe has gone down substantially since its peak in 2015. Meanwhile, migration patterns have shifted, as Italy closes its ports amidst an increase in anti-immigrant populism.
Doctors Without Borders, which operates the Aquarius, "strongly condemns" the request and says allegations of improperly disposed medical and other waste are "unfounded and sinister."
Far more immigrants and asylum-seekers are crossing the Spanish border than those entering other usual Mediterranean entry points Greece and Italy.
While some European countries are turning away migrants rescued at sea, Spain is taking them in. A ship carrying dozens of asylum-seekers arrived today in prosperous and welcoming Barcelona.
Italy and Malta turned away the migrant rescue ship Aquarius, leaving it stranded in the Mediterranean for days. Now that Spain is accepting the ship, Italian and Maltese navies are assisting.
A rescue ship picked up more than 600 migrants off the coast of Libya, and was left stranded after Malta and Italy turned it away. Italy's new government has vowed a tougher stance on immigration.
If the death toll is confirmed, it would reportedly be this year's deadliest shipwreck in the Mediterranean Sea.
European governments aiming to stem an exodus of refugees from Libya have been knowingly complicit in the abuse of would-be migrants held in detention centers there, says Amnesty International.