The Spanish government has pledged to stop the poll, which is declared illegal by the country's constitutional court.
The Spanish government in Madrid invoked article 155 of the country's constitution, dismantling Catalonia's autonomy.
Manchester City manager Pep Guardiola defiantly wore a yellow ribbon on his suit in support of jailed pro-independence Catalan politicians during his side's 3-0 League Cup final victory over Arsenal at Wembley Stadium on Sunday.
The Islamic State has claimed responsibility for the attack. According to US monitor SITE Intelligence Group, the extremist group's propaganda outlet AMAQ claimed that the executors of the attack were soldiers of the Islamic State.
He said a landslide victory in the region's disputed October 1 referendum on independence gives his government grounds to implement its long-held desire to break century-old ties with Spain.
News of all that's transpired on and off the football field
A summary of sports events and sports persons, who made news on Saturday