The partly dried-out bed of the River Danube is pictured in Mariaposching, southern Germany, on Wednesday.

The partly dried-out bed of the River Danube is pictured in Mariaposching, southern Germany, on Wednesday.

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Record temperatures could hit Spain, Portugal amid European heat wave

Forecasters have warned of potentially record-breaking temperatures in Spain and Portugal this week as much of Europe swelters in a heat wave that has left some farmers suffering drought conditions.