RIPOLL, Spain — A missing imam and a house that exploded days ago became the focus Saturday of the investigation into an extremist cell responsible for two deadly attacks in Barcelona and a nearby resort, as authorities narrowed in on who radicalized a group of young men in northeastern Spain.

Investigators searched the home of Abdelbaki Es Satty, an imam who in June abruptly quit working at a mosque in the town of Ripoll, the home of the Islamic radicals behind the attacks that killed 14 people and wounded over 120 in the last few days. Police were trying to determine whether Es Satty was killed in a botched bomb-making operation Wednesday, the eve of the Barcelona bloodshed.

His former mosque has denounced the deadly attacks and weeping relatives marched into a Ripoll square Saturday, tearfully denying any knowledge of the radical plans of their sons and brothers. At least one of the suspects is still on the run, and his younger brother has disappeared, as has the younger brother of one of the five attackers slain Friday by police.

Catalan police said a manhunt was centered on Younes Abouyaaquoub, a 22-year-old Moroccan suspected of driving the van that plowed into a packed Barcelona promenade Thursday, killing 13 people and injuring 120. Another attack early Friday killed one person and wounded five in the resort of Cambrils.

The Islamic State has claimed responsibility for both.

Everyone so far known in the cell grew up in Ripoll, a town in the Catalan foothills near the French border 62 miles north of Barcelona. Spanish police searched nine homes in Ripoll, including Es Satty’s, and two buses, and set up a roadblock that checked each car entering the town. Across the Pyrenees, French police carried out extra border checks on people coming in from Spain.

Neighbors, family and even the mayor of Ripoll said they were shocked by news of the alleged involvement of the young men, whom all described as integrated Spanish and Catalan speakers with friends of all backgrounds.

Even with Abouyaaquoub at large, Spanish Interior Minister Juan Ignacio Zoido declared the cell “broken” Saturday. In addition to the five killed by police, four were in custody and one or two were killed in a house explosion Wednesday. He said there was no new imminent threat of attack.

Police also conducted a series of controlled explosions Saturday in the town of Alcanar, south of Barcelona, where the attacks were planned in a house that was destroyed Wednesday by an explosion.

Authorities initially thought it was a gas accident, but took another look after the attacks.

Initially, only one person was believed killed in the Wednesday blast. But officials said DNA tests were underway to determine if human remains found there Friday were from a second victim. A police official, speaking on condition of anonymity to discuss the ongoing searches, said investigators believe the remains may belong to Es Satty.

The official said investigators also discovered ingredients of the explosive TATP, used by the Islamic State in attacks in Paris and Brussels, as well as multiple butane tanks that the group may have wanted to combine with the homemade explosive and load into their vehicles.

Neighbors on Saturday said they had seen three vehicles coming and going from the home, including an Audi used in the Cambrils attack and the van used in the Barcelona attack.

The president of the mosque where Es Satty preached, Ali Yassine, said he hadn’t seen him since June, when he announced he was returning to Morocco for three months.

“He left the same way he came,” said a bitter Wafa Marsi, a friend to many of the attackers, who appeared Saturday alongside their families to denounce terrorism.

Members of Ripoll’s Muslim community denounced the vehicle attacks and offered their sympathy to the families of the victims.