The top suspect behind last week's Paris attacks was watched by police being led into a building by a woman suicide bomber the evening before they both died there during a raid by special forces, a police source said Friday. Police had been tapping the phone of Hasna Aitboulahcen as part of a drugs investigation and were able to track her down to the Saint-Denis suburb north of the French capital. They watched the 26-year-old take Abdelhamid Abaaoud, suspected mastermind of the Nov. 13 bombings and shootings that killed 130 people, into the building where both died early Wednesday morning. She detonated a suicide belt during the seven-hour police assault on the building, where officials said a third unidentified person died with them. Aitboulahcen may be Abaaoud's cousin. Once they learned Abaaoud was in France from Moroccan officials, French police focused on Aitboulahcen, a woman with links to him whom they were already trailing. So far, police have searched 793 premises, held 90 people for questioning, put 164 under house arrest and recovered 174 weapons including assault rifles and other guns, the Interior Ministry said Friday. Police searched a mosque in Brest in western France. Its imam, Rachid Abou Houdeyfa, who has strongly condemned the Paris attacks, achieved notoriety earlier this year after telling children they could be turned into pigs for listening to music. Two of the three suicide bombers who blew themselves up near the Stade de France stadium in the Paris attacks a week ago had passed through Greece posing as migrants fleeing the Syrian war, Paris prosecutor Francois Molins said Friday. It was already known that one of the men had been registered in Greece – a key entry point for migrants – on Oct. 3 but a second man "has been formally identified as being the individual whose handprints correspond to those of the check in Greece" on the same day, Molins said. Moroccan-born Abaaoud, 28, was spotted on the CCTV tape at 10:14 p.m. (21:14 GMT) Friday last week, after shootings at several cafes and suicide bombings near a packed football stadium, but while an attack was still under way at the Bataclan concert venue. Abaaoud was one of ISIS' highest-profile European recruits, appearing in its slick online English-language magazine Dabiq, where he boasted of crossing European borders to stage attacks. He claimed to have escaped a manhunt after a police raid in Belgium in 2013 in which two militants died. Moroccan authorities arrested his younger brother Yassine last month after he arrived in Agadir and has been held in custody since, a Moroccan security source said Friday. Swedish Interior Minister Anders Ygeman said Friday a police raid in which a young man was detained on suspicion of preparing a "terrorist crime" like the Paris attacks could be followed by more arrests with the Nordic country on its highest ever security alert. The raid resulted in the arrest Thursday of a suspect in a building complex in northern Sweden housing asylum seekers. Citing unidentified sources, Swedish news agency TT said the raid was carried out after foreign security services passed on information to Sweden about suspicious encrypted communications between the country and the Middle East. Prosecutors Friday submitted documents to a district court showing the apprehended man, identified as Moder Mothama Magid, 22, was suspected of having plotted in Stockholm to carry out an unspecified "terrorist crime." Unconfirmed Swedish media reports said Magid was an Iraqi national. The warning of a high probability of an attack jarred Sweden, prompting many commuters in Stockholm to avoid mass transit trains and triggering a security clampdown at potential targets as well as a government push to increase surveillance.