BRUSSELS (AFP) - The European Union blasted Athens for its handling of the migrant crisis on Wednesday, saying it had "seriously neglected" its duty to protect the bloc's frontiers, raising the prospect of border controls with the rest of the passport-free zone.
The criticism came ahead of a Swedish announcement that it intends to expel up to 80,000 migrants who arrived in 2015 and whose application for asylum has been rejected.
Flimsy boats packed with migrants are still arriving on Greek beaches every day, with the passengers - mostly fleeing conflict in Syria, Iraq and Afghanistan - undeterred by cold wintry conditions.
Rescuers on Wednesday found the bodies of seven more drowned migrants, including two children, after their boat sank near the Greek island of Kos - just five days after 45 people perished in the Aegean Sea.
The European Commission said Greece could face border controls with the rest of the EU's passport-free Schengen zone if it fails to act.
"The draft report concludes that Greece seriously neglected its obligations and that there are serious deficiencies in the carrying out of external border controls that must be overcome and dealt with by Greek authorities," Commission Vice President Valdis Dombrovskis told a press conference.
The highly critical draft report found Greece was failing to properly register and fingerprint migrants, with security concerns still high after revelations that two militants behind November's Paris attacks slipped into Europe by posing as refugees.
Its findings pile further pressure on a country that has been fending off calls that it should face possible suspension from the 26-country Schengen zone, a cherished symbol of European unity.
The report could pave the way for Brussels to authorise EU members to exceptionally extend border controls within the Schengen area - including with Greece - for up to two years, instead of the normal six months.
Greece blasted the report as "unconstructive", accusing its EU peers of trying to shift blame instead of coming up with a joint solution to the continent's worst migration crisis since World War II.
"This tactic of diverting responsibility is not an effective response to a problem of historic dimensions, which requires joint action," said government spokesperson Olga Gerovassili.
Greece "is doing everything it can to respect its obligations, and we expect everyone else to do the same," she added.
And Greek junior migration minister Yannis Mouzalas told AFP the situation had changed since the EU carried out its inspection for the report at the Turkish land border and on several Greek islands.
The UN says more than 46,000 people have arrived in Greece so far this year, with more than 170 people killed making the dangerous crossing.
In Brussels, Dombrovskis said that if a majority of the 28 EU member states adopt the Commission's report, it will draw up a plan for shoring up Greece's borders, especially its sea frontier with Turkey.
"Greece will then have three months to implement remedial actions," Dombrovskis said. "If necessary remedial actions are not being taken there is a possibility... which would allow member states to temporarily close their borders."
In the last few months, Austria, Germany, Denmark, Sweden, France and non-EU member Norway have all introduced six-month temporary controls in a bid to contain the influx.
Sweden, which accepted more than 160,000 asylum seekers last year, is one of the European Union countries that has taken in the largest number of refugees in relation to its population of 9.8 million.
Announcing the plan to deport up to 80,000 migrants, Interior Minister Anders Ygeman said the mass expulsions would have to be done using specially chartered aircraft and staggered over several years.
Swedish officials have called for greater security at overcrowded asylum centres after the fatal stabbing this week of an employee at a refugee centre for unaccompanied youths.
Her death has led to questions about overcrowded conditions inside some centres, with too few adults and employees to take care of children, many traumatised by war.
Greece is not the only country under fire over its handling of the migrant crisis, with Denmark facing criticism on Wednesday after its lawmakers passed a bill allowing authorities to seize valuables from refugees.
Some likened the move to the Nazis' confiscation of gold from Jews during the Holocaust, with Human Rights Watch denouncing the bill as "despicable".