BARCELONA, Spain — Grief-stricken Barcelona paid homage on Sunday to victims of two terror assaults at a mass in the city’s Sagrada Familia church.

King Felipe, Prime Minister Mariano Rajoy and Catalonia’s president Carles Puigdemont led the ceremony mourning the 14 people killed by militants who used vehicles to mow down pedestrians in Barcelona’s Las Ramblas boulevard on Thursday and in the nearby seaside resort of Cambrils early Friday.

“These have been days of tears, many tears,” said auxiliary bishop Sebastia Taltavull.

Outside the church, snipers were posted on rooftops surrounding the landmark building by Gaudi, while heavily armed police stood guard as hundreds of people gathered under grey skies.

Catalonia resident Teresa Rodriguez said she had turned up to pray for the victims.

“What happened in Las Ramblas is really hard for us, we go for walks there often, it could have happened to me, my children or anyone. And here we are. It’s huge, huge,” she said as she fought back tears.

Meanwhile, Spanish police put up scores of roadblocks across the northeast as the manhunt continued on Sunday for the suspected driver of the van that plowed into pedestrians in Barcelona.

Police in Catalonia are searching for Younes Abouyaaquoub, a 22-year-old Moroccan suspected of carrying out the attack.

The investigation is also focusing on a missing imam who police think could have died in a massive house explosion on Wednesday in Alcanar. Police believe imam Abdelbaki Es Satty radicalized the young men in the extremist cell, which may have accidently blown up the house in Alcanar with the explosive material it was collecting. Es Satty in June abruptly quit working at a mosque in Ripoll and has not been seen since.

His former mosque denounced the deadly attacks and weeping relatives marched into a Ripoll square on Saturday, tearfully denying any knowledge of the radical plans of their sons and brothers. Abouyaaquoub's mother said his younger brother Hussein has also disappeared, as has the younger brother of one of five radicals slain on Friday by police during the Cambrils attack.

Spanish media quoting police sources, said the officers were looking for DNA traces in the apartment to compare with body parts found in an explosion in a home in Alcanar, about 200 km south of Barcelona, where the alleged militants were believed to have been building bombs.

Police said they believed the suspects were planning a much larger attack.

“They were preparing one or several attacks in Barcelona, and an explosion in Alcanar stopped this as they no longer had the material they needed to commit attacks of an even bigger scope,” said Josep Lluis Trapero of Catalonia’s police.

Security forces were seen removing dozens of gas canisters from the house in Alcanar on Friday.

The imam was also known to police, according to Spanish media, which reported that he had spent time in prison.

El Pais and El Mundo quoting anti-terrorist forces said the imam had met prisoners linked to the March 2004 Al-Qaeda-inspired bombing attack on commuter trains in Madrid that killed 191 people, the worst terror attack in Europe.

A clearer picture is emerging of the suspected perpetrators. — Agencies