PARIS (AP) — The number of people linked to the Islamic State network that attacked Paris and Brussels reaches easily into the dozens, with a series of new arrests over the weekend that confirmed the cell’s toxic reach and ability to move around unnoticed in Europe’s criminal underworld.

From Belgium’s Molenbeek to Sweden’s Malmo, new names are added nearly daily to the list of hardened attackers, hangers-on, and tacit supporters of the cell that killed 130 people in Paris and 32 in Brussels. A computer abandoned by one of the Brussels suicide bombers in a trash can contained not only his will, but is beginning to give up other information as well, including an audio file indicating the cell was getting its orders directly from a French-speaking extremist in Syria, according to a police official with knowledge of the investigation. The official spoke on condition of anonymity because he wasn’t authorized to speak publicly about the investigation.

Ten men are known to be directly involved in the Nov. 13 attacks in Paris; others with key logistical roles then — including the bomber, a logistics handler, and a hideout scout — went on to plot the attack March 22 in Brussels. But unlike Paris, at least two people who survived the attack have been taken into custody alive, including Mohamed Abrini, the Molenbeek native who walked away from the Brussels international airport after his explosives failed to detonate.

But investigators fear it may not be enough to stave off another attack. Abdelhamid Abaaoud, another Molenbeek native whose charisma made him a natural draw to many in the Brussels neighborhood after he joined IS extremists in Syria, said before his death that he returned to Europe among a group of 90 fighters from Europe and the Mideast, according to testimony from a woman who tipped police to his location.

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In part from NYT’s: But only in the months since then has the full scale of Mr. Zerkani’s diligent work on the streets of Molenbeek and beyond become clear, as the network he helped nurture has emerged as a central element in attacks in both Paris and Brussels— as well as one in France that the authorities said last month they had foiled.

“Mr. Zerkani has perverted an entire generation of youngsters, particularly in the Molenbeek neighborhood,” the Belgian federal prosecutor, Bernard Michel, said in February.

But court documents and interviews with Molenbeek residents and activists, as well as with Belgian security officials, suggest that he had direct or indirect connections with several crucial figures who are now dead or under arrest in connection with the November massacre in Paris that killed 130 people and the bombings last month in Brussels that killed 32. Full article here.

Top U.S. intel official: Europe not taking advantage of terror tracking tools

(CNN) A top U.S. counterterrorism official in charge of ensuring terrorists do not make it into the United States said European countries can do more to screen terrorists because they don’t take full advantage of tools the U.S. has offered in the fight against terrorism.

“It’s concerning that our partners don’t use all of our data,” said Terrorist Screening Center Director Christopher Piehota in an exclusive interview with CNN. “We provide them with tools. We provide them with support, and I would find it concerning that they don’t use these tools to help screen for their own aviation security, maritime security, border screening, visas, things like that for travel.”

Piehota said the U.S. shares its watch lists with EU countries, but that EU countries don’t systematically utilize it to identify suspected terrorists or screen migrants coming.

The European Union does not utilize a central terror database; instead, each country maintains its own terrorist watch list that comes with its own unique set of standards for tracking terrorists. Further complicating matters the 26 European countries that operate inside the “Schengen zone” do not perform routine border checks.

Piehota said all European countries cooperate with the United States to varying degrees and information sharing has greatly improved in the wake of the ISIS threat.

The daunting task of guarding the United States from foreign terrorists, he says, has become more challenging with the evolving ISIS threat in Europe.

One chief concern is foreign nationals from visa-waiver countries who do not appear on any watch list could possibly slip into the U.S. to launch an attack. For example, would-be terrorists can surreptitiously travel to and from Syria from Europe and then travel to the U.S. without ever arousing the suspicion of government officials on either continent.

“There are many that we do know about. And unfortunately there are some that we do not know about,” Piehota said.

Counterterrorism officials like Piehota also worry about the ISIS terrorists believed to still be in Europe and possibly plotting future attacks. One such person is the man in the hat seen in the Brussels airport surveillance video who remains on the run.

“It’s highly concerning,” he said. “We make sure that we know as much as we can. And we take that information and we use it the best we can to minimize threats to our communities. But we can’t know everything all the time.”

European officials have acknowledged the gaps in coverage and communication in the weeks following the Brussels attacks.

“The fragmented intelligence picture around this dispersed community of suspected terrorists is very challenging for European authorities,” said Rob Wainwright, director of the European Police Agency known as Europol.

The EU’s Counter-Terrorism Chief Gilles de Kerchove told CNN that he was aware of problems in getting member states to act.

“I do my best to put pressure, to confront them with blunt figures, and we are making progress, but not quickly enough,” he said.

The European Union has been examining the sharing of passenger information for at least six years, and the European Parliament is expected to consider a measure related to that issue this month. Some members oppose the idea on privacy grounds.

“That will require difficult discussions with European Parliament, because we’re sensitive about balance between security and freedom,” de Kerchove said last month.

Piehota also echoed the sentiment from FBI Director James Comey that there’s risk with the U.S. plan of allowing 100,000 refugees into the U.S. a year by 2017 partially because of the lack of intelligence on people in Syria.

“Nothing we can guarantee is at a 100% level,” Piehota said, adding he believes the vetting process is rigorous with a layered approach of screening, evaluation and assessment for the refugees who will be cross-referenced with all the U.S. watch lists.

Piehota also addressed what he called “incorrect perceptions” about the U.S. watch lists, many that have been repeated by presidential candidates on the campaign trail claiming a majority of people on the lists are innocent Americans.

Although declined to say how many people are on the watch list, he did say Americans “comprise less than 0.5% of the total populations. Very small, controlled population,” adding that those on the list are consistently re-evaulated with 1,500 changes to the list on average per day. More here.