After the attack, the police told people not to pass through the area near Plaza de Cataluña and Las Ramblas in the heart of the city, popular destinations for tourists.
Local media were at one point reporting that hostages were being held at a bar near the scene of the attack by other assailants, but later reports cast doubt on the matter. Residents of Barcelona, and social media users from further afield, have tried to combat the spread of these images with a seemingly freaky tactic - flooding the #Barcelona hashtag with images of cute kittens.
Spain was hit by what is still Europe's deadliest jihadist attack in March 2004, when bombs exploded on commuter trains in Madrid, killing 191 people in an attack claimed by Al Qaeda-inspired extremists. It was such a chaotic situation.
Deputy Foreign Minister Tzipi Hotovely quickly condemned the attack in Barcelona, posting on Twitter: "I condemn this deplorable act of terror and senseless death, and stand with Spain with prayers for the fast recovery of the victims".
Police in Spain have arrested two suspects in the Barcelona terror attack, but their identities are still unclear.
This statement was issued after the program announced via Twitter the team and entire travel party is "safe and accounted for" following the terrorist attack.
"Spain, we grieve with you and denounce hate and violence in all of its forms".
"We heard what sounded like shots, and then we saw hundreds of people rushing toward us", Davey said.
Secretary of State Rex Tillerson offered condolences to victims of the attack during an appearance before journalists at the State Department. They did not specify whether Oukabir is the suspect they have in custody, however.
Oregon State's basketball team was close to where the terrorist attack took place.
Keith Fleming, who lives in Barcelona, saw the aftermath of the attack from his balcony. "We will remain united and determined". "We will never be cowed by such barbarism".
Witness Aamer Anwar told Sky News he heard a crash, and saw people running and screaming.
Earlier, Spanish police described the carnage as "massive".
London has had three vehicle-related terror attacks this year.
At least 13 people dead.
Police also confirmed that two vans were used in conjunction with the attack to the CBC, both of which have been found by police.
On June 19, a van driven by Darren Osborne rammed pedestrians near the Finsbury Park Mosque during Ramadan.