BARCELONA — Police in Barcelona, Spain have made a third** arrest after a van targeted crowds in a tourist heavy district, killing 13 people and injuring at least 100 others, 15 seriously. 

Authorities have also thwarted a second attack in a seaside resort just south of Barcelona.

Police in Spain say they’ve killed five people in a counter-terror raid just south of Barcelona — preventing what might have been the country’s SECOND major terror attack on Thursday. Authorities say the men, in the resort town of Cambrils, were wearing FAKE explosive belts. Local media is reporting before being gunned down by police, the assailants hit several civilians and a police officer with a car.

Investigators say this incident IS linked to the attack earlier in the day in Barcelona, where a van plowed through crowds in the historic Las Ramblas district, filled with tourists. An American witness, who asked not to be identified, arrived just as it was happening.
“I heard this just group of people scream. Then I looked to my left and I saw a white van it looked to be as if he was going left to right hitting people at the little stands, people that were shopping.”

Police say three men are under arrest.

The Spanish Prime Minister called the attack “jihadi terrorism”. Islamic State has claimed responsibility.

“Any place where people gather, restaurants, squares, you can’t protect all of them and sadly the enemy, ISIS, is taking advantage of that,” explains Fran Townsend, CBS News senior national security analyst.

Officials in Spain say citizens from 24 countries were among those killed and injured in Barcelona.

(Gavin Ramjaun, for CBS News)