Prosecutors said one of the killers had been stopped and fingerprinted in Greece last month, fuelling speculation that the Islamic State had taken advantage of the recent influx of refugees fleeing the Middle East to slip militants into Europe. The Paris carnage, which killed 129 people, has led to calls for the European Union to close its borders.
Meanwhile, French Prime Minister Manuel Valls said on Monday that the Paris attacks were planned and organised from Syria. “The attack was organised, conceived, and planned from Syria,” CNN quoted Valls as saying in a radio interview.
The prime minister said more than 150 raids were conducted on militant targets in different areas of France earlier in the day.
“We are making use of the legal framework of the state of emergency to question people who are part of the radical jihadi movement... and all those who advocate hate of the republic,” he said. At least nine people have been arrested so far. Five of the detainees were identified over the weekend, and on Monday another two were named by the Paris prosecutor as Ahmad al-Mohammad and Samy Amimour, a BBC report said.
Valls warned that France could be hit by new violence but said the Islamic State, which has claimed responsibility for the attacks in retaliation for French airstrikes in Iraq and Syria, would never win.
Interior minister Bernard Cazeneuve told journalists on Monday police arrested 23 people and seized arms including rocket launchers in 168 raids overnight. Another 104 people were put under house arrest, he said.
“Let this be clear to everyone, this is just the beginning, these actions are going to continue,” Cazeneuve said. French warplanes pounded Islamic State positions in its Syrian stronghold Raqqa late Sunday — its biggest such strike since it started assaults as part of a US-led mission launched in 2014.
The investigation into the coordinated Paris attacks, the worst atrocity in France since World War Two, led swiftly to Belgium after police discovered that two of the cars used by the militants had been rented in the Brussels region.
By Sunday, Belgian officials said they had arrested seven people in Brussels, while another man — one of three brothers believed to have been involved in the plot — was being hunted.
A source close to the investigation said Belgian national Abdelhamid Abaaoud, currently in Syria, was suspected of having ordered the Paris operation. “He appears to be the brains behind several planned attacks in Europe,” the source said.
French prosecutors say they have identified five of the seven suicide attackers who died on Friday. Of these, four were French, while the fifth man was fingerprinted in Greece in October and was possibly a Syrian.
Valls said since this summer, French intelligence services had prevented five attacks. “We know that more attacks are being prepared, not just against France but also against other European countries,” Valls told RTL radio. “We are going to live with this terrorist threat for a long time.” A major action with heavily armed police is underway in the Brussels neighborhood of Molenbeek amid a manhunt for a suspect of the Paris attacks. Police arrested three suspects in the impoverished Brussels neighborhood on Saturday.