BARCELONA, Spain (CBSNewYork) — Police in Spain say a fourth person has been arrested in connection with the attacks in Barcelona and Cambrils as the death toll Friday was raised to 14.

Police announced the arrest on Twitter, but did not provide other details. Earlier, Catalonia’s regional president, Carles Puigdemont, said there was at least one “terrorist still out there.”

Meanwhile, authorities say a woman hurt in an attack in Cambrils, a resort town south of Barcelona, has died, raising the death toll to 14.

The attack happened overnight. Police said five suspects wearing fake bomb belts were shot and killed by officers after a car there struck and injured several people, including a police officer.

The incident in Cambrils came hours after a van attack in Barcelona, where 13 people were killed and more than 100 others were injured.

The State Department announced Friday that an American was among those killed. He was identified as Jared Tucker, 43, of Walnut Creek, California. His family says he was honeymooning with his wife, Heidi, when the chaos erupted.

Dan Tucker is grappling with the fact that his son was the only American known to be killed in the attack.

“We have a fishing trip planned on the 30th and a wedding to go to on the 2nd of September, and it’s hard to understand that none of that is ever going to happen,” Dan Tucker said.

Another American was also hurt in the attacks, officials said.

Witnesses say the van drove through seven city blocks Thursday, swerving from side to side as if trying to hit as many people as possible, as residents and tourists ran for safety.

“Upon impact, you just start seeing bodies, and you start seeing people sprinting, and you could tell that was the definition of fear,” said Alex Luca, a New Yorker on vacation.

“I counted six or eight bodies within a block and a half,” another witness said. “I saw a policeman with a child in her arms running up the street.”

Once the van stopped, the driver ran away on foot. The driver has been identified by Spanish media as 17-year-old Moussa Oukabir. Police arrested his brother, 28-year-old Moroccan-born Driss Oukabir, who was linked to renting the van, possibly, investigators say, for his brother.

Police say a group of at least eight people were originally planning a series of attacks using gas canisters. An explosion that leveled a house on Wednesday was thought to be simply a gas explosion, but now investigators think it may be connected to Thursday’s attacks.

Police say there’s a chance the driver could have been one of the five suspects killed. Even so, the manhunt continues.

The Islamic State group has claimed responsibility, saying it was carried out by “soldiers of the Islamic State.”

“Pretty good planning, although their execution of the explosive elements was not so good,” said CBS National Security Analyst Fran Townsend. “I think that this looks like, as you’re hearing from law enforcement now, much more directly controlled than just merely inspired. This wasn’t somebody who got up and decided to take a car and ram it in a crowd. This was much more deliberate.”

President Donald Trump addressed the attacks in Spain on Twitter Friday morning, saying: “Radical Islamic Terrorism must be stopped by whatever means necessary! The courts must give us back our protective rights. Have to be tough!”

Authorities say the victims come from at least 24 different countries.

Police in Spain say 17 of the injured victims are in critical condition and the death toll is expected to rise.

Watch & Listen LIVE