According to official results, Prime Minister Antonio Costa's centre-left Socialist Party received almost 40 percent of the vote but fell short of winning a complete majority in the country's parliament.
The tourist bus – which was carrying 55 passengers and a tour guide in addition to the driver – overturned in a residential area in the coastal town of Canico.
Portugal's Prime Minister Antonio Costa has accepted the resignation of Interior Minister Constanca Urbano de Sousa, who has been criticised for her handling of wildfires that killed more than a hundred people in the past four months.
After a four year investigation, former Portuguese Premier Jose Socrates has been indicted on graft and money laundering charges.
Eurovision Song Contest winner Salvador Sobral was greeted by thousands upon his return home on Sunday.
More than a thousand people have been evacuated and sent to makeshift shelters and army barracks.
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