BARCELONA, Spain _ As police hunted for the driver who plowed into pedestrians on a popular promenade in Barcelona, evidence emerged of a wider plot that could have inflicted more casualties.
Authorities in the Spanish region of Catalonia arrested four people and were looking for three others in connection with Thursday's vehicular assault and a similar attack hours later in the resort town of Cambrils, about 80 miles southwest of Barcelona. At least 14 people were killed in all and more than 100 others were injured.
Investigators were trying to determine whether any of the suspects being sought were among the five assailants shot to death by police in Cambrils or two people killed in an explosion Wednesday night in Alcanar, a town about 20 miles farther down the coast.
Police believe the plotters, who they say are all of Moroccan descent, may have been using the house where the blast took place to build bombs. Had they succeeded, the attacks Thursday could have been far more devastating, Catalonia's police chief, Josep Lluis Trapero, said.
Islamic State claimed that its "soldiers" carried out the Barcelona attack, which killed 13 people _ the most to die in a terrorist attack in Spain in more than a decade.
The growing list of suspects and multiple targets suggested the kind of coordination and planning seen in two major attacks in Paris in 2015 and another in Brussels the following year. More recent attacks in Berlin, London, Stockholm and Nice, France, were carried out by assailants who were mostly acting on their own.
Meanwhile, two people were killed and six injured by a knife-wielding assailant in Turku, Finland, police said. The suspect was shot in the leg and arrested, according to the Southwestern Finland Police Service.
There were also reports of a person killed and another injured in a stabbing at a store in Wuppertal, Germany.
The motives for the latest attacks were not immediately clear.
Victims of the Barcelona attack included people from at least 34 nations, including the United States and countries across Europe.
European officials began to identify the dead, including Jered Tucker, 43, of Lafayette, Calif., who was in Barcelona on his honeymoon; Elke Vanbockrijck, 44, of Belgium; Bruno Gulotta of Italy; and Francisco Lopez Rodriguez, 60, from the Spanish province of Granada.
The bloodshed began Thursday evening when a van sped down a pedestrian walkway in the middle of Las Ramblas, a Barcelona thoroughfare. The driver fled on foot, prompting a manhunt throughout northeastern Spain.
Around 1 a.m. Friday, a sedan carrying five men ran into a group of people near the boardwalk in Cambrils, striking pedestrians and police, officials said. The men left the overturned vehicle armed with knives, axes and what looked like explosive belts, which turned out to be fakes, authorities said.
Five people were injured, including a police officer, and a woman was killed before police shot the attackers, officials said.
Authorities identified three of the dead assailants as Moussa Oukabir, 17; Mohamed Hychami, 24; and Said Aallaa, 18.
Oukabir is the younger brother of a man whose identity documents were found in the van used in the Barcelona attack. The man, who was arrested Thursday, denies any involvement and has said his brother may have stolen the documents.
Oukabir was initially suspected to have carried out the attack in Barcelona, but Catalonia's Interior minister, Joaquim Forn, said that no longer appeared to have been the case.
Police were still trying to find Younes Abouyaaqoub, 22, and two other suspects.
On Friday, the Las Ramblas walkway reopened to the public, with residents and tourists allowed past police lines to reach their homes and hotels. The city center remained under heavy surveillance.
More than 100,000 people, including King Felipe VI and Spanish Prime Minister Mariano Rajoy, gathered at midday Friday near the promenade for a moment of silence. Afterward, the crowd erupted in applause and chants of "I am not afraid."
The attacks shattered the sense among some tourists that Spain, until now spared the recent spate of Islamist-inspired violence seen in Britain, France and other countries, was somehow safer than the rest of Europe.
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(Cavazos is a special correspondent. Linthicum and Zavis reported from Mexico City and Los Angeles, respectively. Tracy Wilkinson in Washington contributed to this report.)
