Story highlights EU interior ministers pass quota plan for migrants; presidents and PMs to vote on the plan Wednesday

Four countries voted against the plan in interior ministers' meeting, but source says they'll have to take in migrants anyway

Croatian officials say 2,400 migrants entered the country in just 12 hours

(CNN) European Union interior ministers on Tuesday voted in favor of a quota system to relocate 120,000 asylum-seekers in Europe, an EU source told CNN's Nic Robertson.

Now the plan goes to EU presidents and prime ministers, who are scheduled to meet in Brussels, Belgium, on Wednesday to consider it.

In the interior ministers' vote, four countries -- Romania, the Czech Republic, Slovakia and Hungary -- opposed quotas, but they will be obligated to take in asylum-seekers, the source said. Finland abstained.

Eastern European countries in particular have shown resistance to committing to quotas, as reflected in those countries that voted against the idea at Tuesday's meeting in Brussels.

They'll have to comply with the resettlement plan even if they voted against it, the EU source said.

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