Swedish police say an early-morning fire has destroyed a house intended to house refugees in Eskiltuna near Stockholm. Two people are reported missing.

Spokesman Paul Edenstrom says the whereabouts of a couple who were listed as living at the address is not known, but they were believed to be in the building when the fire started.

Edenstrom said the fire is being investigated as a case of arson.

In recent weeks, Sweden has seen a spate of arson attacks on asylum centers or buildings to be used as such as an influx of refugees has surged. Immigration officials estimate some 190,000 asylum-seekers will arrive this year, second only to Germany in Western Europe.

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Amnesty International is warning of a humanitarian disaster unless countries on the Balkans migrant route come up with a plan at a summit this weekend on how to tackle the crisis.

The group's branch in Slovenia said in a statement Saturday that migrants are still often forced to sleep outside on their way to Western Europe, and that conditions will become more severe as winter set in.

The group says Sunday's summit in Brussels of several EU and Balkan nations must result in a solution.

Leaders "must not walk away from another meeting without a feasible plan on how to protect the needs and rights of the refugees," the group insists.