Spanish police have launched a fresh manhunt for Younes Abouyaaqoub, the Moroccan national named in the Spanish media as the fourth suspect in the Barcelona van attack.
Daesh (IS) terror group has claimed responsibility for Barcelona attack.
The boy suffered a broken leg and his father also sustained leg injuries and suspected internal injuries in Las Ramblas after a white Fiat van drove onto the pavement and into a crowd of people in the busy area on Thursday killing 13. He was referring to a blast in a building filled with propane canisters in the town of Alcanar on Wednesday, which killed one person and was caused by an attempt to make explosive devices.
Police believe the house in Alcanar was being used as a makeshift bomb factory to plan the attacks in Barcelona, possibly using large butane gas canisters in even larger-scale attacks.
The group had apparently planned to conduct a series of terrorist attacks in Barcelona, with a suspect mistakenly detonating an explosive and destroying the residence, police said.
Thousands observed a minute of silence Friday in Barcelona's main square for the victims of two vehicular attacks that left at least 14 people dead and more than 100 injured.
Earlier Friday, May spoke with Spanish Prime Minister Maiano Rajoy over the double terror attacks.
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"Our thoughts are with the Canadians who were affected by the terrorist attack that occurred in Barcelona, Spain", Global Affairs Canada said in a statement. Police are also looking for Moussa Oukabir, aged around 17, whose older brother Drissa was among the three already arrested.
All men are said to be of Moroccan origin and from the Spanish city of Ripoll near the border to France.
"(The police) were just everywhere, they were walking with their guns, and it was a bit surreal", said Gurzu, who went to the scene of the attack about two hours after it took place to see what was going on.
He said "terrorists around the world should know that the United States and our allies are resolved to find you and bring you to justice".
The initial attack happened late on a warm, sunny afternoon, when the broad thoroughfare was crowded with people enjoying the many shops, restaurants and bars.
The preliminary report, which mentions these nationalities among others, still doesn't specify whether the people on the list are causalities or injured victims.