The first boat, which signalled for help yesterday, had nearly 50 people on board, while the second had as many as 400 passengers.
The latest tragedy comes after authorities in Austria said it may be some time before they know how many people perished in a lorry which was abandoned on a roadside.
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At least 50 refugees are believed to have suffocated in the Hungarian registered vehicle.
The UN says 2,400 people have died trying to cross the sea to Europe so far this year
