Question: The Valletta Summit on Migration was held to discuss the migration of hostile agents from what militant group?

Context paragraphs:
Al-Nasr (Afghanistan): Al-Nasr (النصر ; Arabic for "Victory") was a Hazara militant group, opposed to the leftist Afghan government during the 1980s After the Revolutionary Council of Islamic Unity of Afghanistan, Al-Nasr was the elite militant group.  The organisation included many young men educated in Kabul, including Shia clergymen, and received support from the Khomeini government.  It was a part of the Tehran Eight political constellation.

European migrant crisis: The European migrant crisis, or the European refugee crisis, is a term given to a period beginning in 2015 when rising numbers of people arrived in the European Union (EU), travelling across the Mediterranean Sea or overland through Southeast Europe.  These people included asylum seekers, but also others, such as economic migrants and some hostile agents, including Islamic State militants disguised as refugees or migrants.

2014 Enugu Government House attack: The 2014 Enugu Government House Attack was carried out on March 8, 2014, when members of the militant group "Biafra Zionist Federation" took control of the state house for about 4 hours and erected the flag of Biafra at the entrance of the house.  The leader of the group Barrister Benjamin Onwuka gave Nigerians living in Biafran territory an ultimatum to vacate their land before March 31, 2014, or face the bloodbath that will come afterward.  It was initially reported that another pro-Biafran militant group MASSOB was responsible for the attack, but this information was later discarded after BZF claimed responsibility for the attack.  Benjamin Onwuka was arrested by the Nigeria Police Force after attempting to carryout a similar attack on Enugu State Broadcasting Service.

Global Forum on Migration and Development: The Global Forum on Migration and Development (GFMD) is a recent initiative of the United Nations Member States to address the migration and development interconnections in practical and action-oriented ways.  It is an informal, non-binding, voluntary and government-led process that marks the culmination of more than a decade of international dialogue on the growing importance of the linkages between migration and development.  It reflects the progressive acknowledgement of the limits of a strictly national approach to migration questions and implications at a global level in an intergovernmental framework.  In view of the societal implications of these issues, civil society representatives have also been involved from the outset in this process.The GFMD Business Mechanism, endorsed at the 2015 GFMD Summit in Istanbul, brings the voice of business to the forum.  There is clearly a mutual interest between governments, the private sector, and civil society, to promote more transparent, effective and humane migration policies, taking into accounts labour market needs.  The International Organisation of Employers (IOE) and the World Economic Forum Global Future Council on Migration coordinate the work of the GFMD Business mechanism.  Together they form the Business Advisory Group.  The GFMD Business Mechanism is housed at the IOE in Geneva.

Valletta Summit on Migration: The Valletta Summit on Migration, also called the Valletta Conference on Migration, was a summit held in Valletta, Malta, on 11–12 November 2015, in which European and African leaders discussed the European migrant crisis.  The summit resulted in the EU setting up an Emergency Trust Fund to promote development in Africa, in return for African countries to help out in the crisis.

Soldiers of Egypt: Soldiers of Egypt (Ajnad Misr in Arabic) is an active Salafist Islamist militant group that has been operating near Cairo, Egypt.  The groups was founded by Humam Muhammed in 2013, after he split away from the Ansar Bait al-Maqdis militant group.  The group claims that its attacks are "retribution" for the August 2013 Rabaa Massacre; notably, the group targets only security forces.  It has warned civilians of the presence of bombs that it has placed.  The Cairo Court for Urgent Matters declared the group a terrorist group on 22 May 2014.  It has been a Proscribed Organisation in the United Kingdom under the Terrorism Act 2000 since November 2014.  The United States Department of State designated it a terrorist organization on 18 December 2014.

Global Migration Group: The Global Migration Group (GMG) is a group consisting of fourteen UN agencies, the World Bank and the International Organisation for Migration that work in cooperation to address global migration issues.  It was created in 2006 by then UN Secretary-General Kofi Annan, in order to better coordinate multilateral migration governance initiatives.  The Group's primary aim is to improve the management of cross-border migration, to promote further research and to develop international norms relating to migration.

Migration Agents Registration Authority: The Office of the Migration Agents Registration Authority (OMARA) is an Australian Government authority that registers migration agents and regulates the Migration Agents profession.  Migration agents assist people to migrate to Australia by using their knowledge of Australian visas and immigration law to complete necessary visa applications and represent them in dealings with the Department of Immigration and Border Protection (previously the Department of Immigration and Citizenship), the Tribunals, The Minister, Federal Courts and High Courts of Australia.

Abubakar Shekau: Abubakar Shekau, also known by the alias "Darul Akeem wa Zamunda Tawheed", or "Darul Tawheed" ("the abode of monotheism") (Arabic: دار التوحيد‎ ‎ ), thought to be born between 1965 and 1975 is a Kanuri man known as the leader of Boko Haram, a Nigerian militant group that has declared loyalty to the Islamist militant group Islamic State of Iraq Syria (ISIS).  He served as deputy leader to the group's founder, Mohammed Yusuf, until Yusuf was executed in 2009.  Nigerian authorities believed that Shekau was killed in 2009 during clashes between security forces and Boko Haram until July 2010, when Shekau appeared in a video claiming leadership of the group.  He has subsequently been reported dead with regularity, and is thought to use body doubles.  In March 2015, Shekau pledged allegiance to ISIL leader Abu Bakr al-Baghdadi.  Shekau is a Salafi.  He has been described as possessing a photographic memory.

Gibril Faal: Gibril Faal (born 10 October 1967) is a British-Gambian business and development executive.  In 2014, he was appointed OBE in the Queen's Birthday Honours List for services to international development, following a nomination by the Department for International Development (DfID).  He is a Visiting Professor in Practice at London School of Economics (Institute of Global Affairs).  He was one of the global leaders who spoke at the 19 September 2016 UN Summit on Refugees and Migrants, joining select presidents, prime ministers and institution leaders to address the question of 'International cooperation'.  Gibril serves as technical expert in the consultations and negotiations for the Global Compact on Migration.  He was the Grand Rapporteur of the Tenth Summit of the Global Forum on Migration and Development (GFMD) in Berlin in June 2017.  He co-moderated Common Space of the Eighth GFMD Summit in Istanbul in October 2015.  He co-chaired the seventh GFMD) in Stockholm in May 2014.  In 2013, he delivered two keynote addresses at the United Nations General Assembly.  He was selected to speak on behalf of global civil society and joined the UN Secretary General to open the High Level Dialogue on Migration and International Development.

Supporting paragraphs: Valletta Summit on Migration European migrant crisis
Answer: Islamic State