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Congressional Research Service
Intorm~ng the legislative debate since 1914


Updated  April 26, 2018


The Islamic State


The Islamic State (IS, also known as ISIL, ISIS, or the
Arabic acronym  Da 'esh) is a transnational Sunni Islamist
insurgent and terrorist group with a few thousand remaining
fighters in Iraq and Syria and an unknown number of
supporters in other countries. Since late 2017, U.S. military
officials have stated that the Islamic State has lost
approximately 98 percent of the territory it once held in Iraq
and Syria. This has changed the nature of related threats,
prompting some  reconsideration of U.S. approaches.
The Islamic State's forerunner was the late Abu Musab al
Zarqawi's organization in Iraq, which became Al Qaeda in
Iraq (AQI) and later the Islamic State of Iraq (ISI). After
expanding into war-torn Syria in 2013, the group declared
the establishment of a caliphate in June 2014 and
changed its name to the Islamic State. After IS leaders
claimed several attacks in the Middle East and Europe, U.S.
officials publicly described the group as having embraced
an external operations agenda. U.S. officials judge that
the group has either directed or inspired terrorist attacks
globally, including in the United States.
In February 2018, the U.S. intelligence community assessed
that ISIS core has started-and probably will maintain-a
robust insurgency in Iraq and Syria as part of a long-term
strategy to ultimately enable the reemergence of its so-
called caliphate. U.S. intelligence officials expect that the
group is likely to focus on regrouping in Iraq and Syria,
enhancing its global presence, championing its cause,
planning international attacks, and encouraging its members
and sympathizers to attack in their home countries.
Groups Affiliated with the Islamic State
Since 2014, some armed  groups have recognized the
Islamic State and pledged loyalty to IS leader Abu Bakr al
Baghdadi. Groups  in Yemen, Egypt, Algeria, Saudi Arabia,
Libya, Afghanistan, and Nigeria have used the Arabic word
wilayah (state/province) to describe themselves as
constituent members of a broader IS-led caliphate. Their
objectives, tactics, and leadership structures vary and are
evolving over time. U.S. intelligence officials expect the
group to seek to leverage the capabilities and operations of
its affiliates to demonstrate resilience in the coming year.
The   Split  with   Al  Qaeda
Al Qaeda  leader Ayman al Zawahiri publicly severed ties
with the Islamic State in February 2014, citing brutal IS
tactics, infighting between the Islamic State and other Sunni
groups, and a long-running dispute over areas of operation.
At the time, IS leaders said their organization is not and
has never been an offshoot of Al Qaeda, and described
previous IS conduct toward Al Qaeda as deference rather
than obedience. Media reports and third-party analyses have
explored competition between the Islamic State and Al
Qaeda  for prominence and support, but it is unclear if Al
Qaeda  will directly benefit from the stark reversal of the
Islamic State's fortunes in its main areas of operation. U.S.


intelligence officials judge that Al Qaeda remains a major
actor in global terrorism.
The   Domestic Threat
U.S. officials consider the Islamic State a direct threat to
U.S. and allied interests overseas and in December 2017
acknowledged  the group's likely desire and capacity to
inspire attacks inside the United States. The December
2015 shooting attack in San Bernardino, California, and the
June 2016 shooting in Orlando, Florida were attributed to
purported IS supporters who have not been reported to have
operational links to the organization. U.S. intelligence
officials reported in February 2018 that the group almost
certainly will continue to give priority to transnational
terrorist attacks, and that U.S.-based homegrown violent
extremists (HVEs) will remain the most prevalent Sunni
violent extremist threat in the United States.
Strategy to Counter the Islamic State
The Trump  Administration has reviewed and amended  U.S.
plans to defeat the Islamic State in its areas of control in
Iraq and Syria. U.S. strategy leverages the contributions of
multinational and local partner forces to reduce the
geographic and political space, manpower, and financial
resources available to the Islamic State. U.S. intelligence
officials cite IS territorial losses, force attrition, and reduced
recruiting as indicators of the group's decline, but warn of
its potential resilience and the potentially high costs of
long-term efforts to stabilize liberated areas. Congress
continues to review and require updates of the
Administration's strategy and plans. The U.S.-led coalition
has pursued a range of measures, including:
Military Operations. U.S. and coalition forces' operations
against IS forces have declined in intensity and frequency
since September 2017, reflecting the end of major combat
operations in Iraq and the isolation of remaining IS fighters
in remote areas of Syria.
Syria. On October 17, 2017, U.S. military officials
announced  that U.S.-backed forces had completed their
operation to retake the IS self-declared capital at Raqqah. In
2018, coalition operations continued against IS remnants in
eastern Syria. In areas closer to the Iraq-Syria border,
operations have brought Syrian government forces and their
allies closer to U.S. forces and U.S. partners, resulting in at
least one instance of armed confrontation. Administration
officials emphasize that the primary purpose of U.S.
operations in Syria is the defeat of the Islamic State.
Iraq. In December 2017, Iraqi leaders proclaimed victory in
their U.S.-backed military campaign against the Islamic
State after recapturing territory near the Syrian border and
sweeping  desert areas in western Anbar Province. Millions
of displaced Iraqi civilians have begun to return home.
Stabilization efforts are underway but are challenged in
some  areas by insecurity, costs, and unexploded ordnance.
Firm U.S. and Iraqi plans for continued U.S. training and


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