Witnesses to the Barcelona terror attack described terrified people screaming and running for their lives after a van plowed through a bustling pedestrian plaza.
The attack in the tourist district of Las Ramblas sparked mass panic, NBC News reported.
"There was this tidal wave of people screaming and running towards us," said Susan McLean, a cybersecurity expert from Australia who was in the area on vacation. "People just heaved around the corner, screaming in Spanish. We had no idea what was going on."
McLean, a former police officer, said she instantly knew what had happened: terrorism.
"The fear on their faces — I just knew," she told NBC News.