The death toll in the last week's terrorist attacks in Spain has reached 16 after a woman died in the intensive care unit of Barcelona's Hospital del Mar on Sunday.
The Mediterranean city has been in mourning after a driver ploughed into crowds on Las Ramblas on August 17, followed hours later by a vehicle attack in the seaside resort town of Cambrils.
Saturday's massive march in the Catalan capital was led by police officers, firemen and medics, who responded to the attacks on August 17 and 18.
The attacks in Las Ramblas in Barcelona and in the seaside resort of Cambrils left about 120 people wounded.
Reports say no less than 500,000-strong demonstrators marched in Barcelona in a huge public rejection of violence following a recent deadly attack in the Spanish city, chanting: "I'm not afraid".
Spain's King King Felipe VI, Prime Minister Mariano Rajoy and the President of Catalonia Carles Puigdemont joined the crowd side by side.More news: Major League Baseball hands down five suspensions from Yankees-Tigers brawl
The phrase "no tinc por" is also reportedly being embraced by the political class in the country in response to the ISIS-backed violence.
Five people remain in a critical condition.
The march comes on the eve of a mass peace demonstration planned for Saturday in Barcelona which King Felipe of Spain is due to attend.
Mayor Ada Colau urged citizens to take part until "the streets of Barcelona are overflowing with people".
In the northeastern town of Ripoll, home for numerous attackers, members of the local Muslim community and other residents gathered in a central square to condemn the deadly attacks. The driver of the van, identified as 22-year-old Younes Abouyaaqoub, was shot dead by police after several days on the run. Two jihadists have been jailed under preliminary charges of terrorism and homicide. "We must all work together to stop this from ever happening again".