Real Madrid star Cristiano Ronaldo has paid tribute on Twitter to Esuebio, posting a photograph of the pair together.
The 71-year-old is reported to have died following a cardiac arrest.
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Groups of dairy farmers have milked supermarket shelves dry across the country in a protest against falling prices.
Seasonal rains have battered the country since late June with more than 150,000 people affected by floods and landslides.
The bus reportedly hit a tree near Russell Square.