A jihadist network spanning 17 prisons had attempted to radicalize inmates and establish a "prison front," according to authorities. Several of the inmates were due to be released, posing a potential security risk.
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Spain's Interior Ministry on Tuesday said police had dismantled a network of jihadists operating in more than a dozen prisons across the country.
"Although the investigation began by focusing on an inmate in a particular prison, to date the illegal activity of the group extended to 17 prisons, which account for 55 percent of jails that house prisoners linked to jihadist terrorism," the ministry said.
'Security risk'
The network attempted to radicalize other inmates in order to establish a "prison front." A source at the interior ministry told AFP news agency that although there was no "concrete plan" to carry out an attack, the ring had created a "belligerent state of mind towards prison staff."
The ring also attempted to bypass mechanisms aimed at monitoring and preventing radicalization within Spain's prison system.
"The very existence of the group is viewed as a potential security risk, even more so given the upcoming release of several of the inmates who were targeted by the investigation," the ministry said.
IS has gone from an obscure al-Qaida splinter group to a global phenomenon. DW takes a look at the defining aspects of the jihadi group — from its "caliphate" to its tactics.
Image: picture-alliance/AP Photo/Al-Furqan
Where did it come from?
The "Islamic State" (IS) — also known as ISIL, ISIS and Daesh — is an al-Qaida splinter group with a militant Sunni Islamist ideology. It emerged in the aftermath of the US-led invasion of Iraq in 2003 and is led by Abu Bakr al-Baghdadi. Their goal is to create a worldwide "caliphate." It gained worldwide notoriety in 2014 after a blitzkrieg military campaign that resulted in the capture of Mosul.
Image: picture-alliance/AP Photo
Where does it operate?
IS is believed to be operational in more than a dozen countries across the world. It controls territories in Iraq and Syria. However, the group has lost much of the territory it controlled in Iraq and Syria at the height of its expansion in 2014.
Who is fighting back?
The US leads an international coalition of more than 50 countries, including several Arab nations. Russia, Iran and its Lebanese Shiite ally Hezbollah, which all support the Syrian government, also fight IS. Regional forces such as the Kurdish peshmerga (above) and US-backed Syrian Kurdish fighters, fight IS on the ground. The Iraqi army and militia have pushed IS from large parts of the country.
Image: picture-alliance/abaca/H. Huseyin
How does it fund itself?
One of IS' main sources of income has been oil and gas. At one point, it controlled an estimated one-third of Syria's oil production. However, US-led airstrikes deliberately targeted oil resources and the Syrian government as well as US-backed Syrian Kurdish fighters have retaken most oil wells. Other means of income include taxes, ransom, selling looted antiquities and extortion.
Image: Getty Images/J. Moore
Where does it carry out attacks?
IS has claimed responsibility for numerous terrorist attacks across the globe. The militant group has targeted capitals across the EU, including Berlin, Brussels and Paris. IS leaders have encouraged so-called "lone wolf" attacks, whereby individuals who support IS carry out terrorist acts without the direct involvement of the group.
Image: picture-alliance/AP Photo/M. Spingler
What other tactics does it use?
The group uses various tactics to expand its power. IS fighters have looted and destroyed historical artifacts in Syria and Iraq in an attempt at "cultural cleansing." The group has also enslaved thousands of women from religious minority groups, including Yazidis. IS also uses a sophisticated social network to distribute propaganda and recruit sympathizers.
Image: Getty Images/AFP/J. Eid
How has it impacted the region?
IS has further exacerbated the ongoing Syrian conflict. Millions of Syrians and Iraqis have fled their homes, many traveling to Europe in pursuit of refuge. Although it has lost all of its strongholds, the militant group has left extraordinary destruction in its wake. Areas affected by the militant group's rule will likely take years to rebuild.
Spain's Interior Ministry noted that the operation to break up the IS-affiliated ring was the first of its kind in Europe and brought together law enforcement agencies with those that manage prison facilities in the country.