On Sept. 21, Islamist militants stormed the Westgate Mall in Nairobi, Kenya, a terror attack that killed at least 62 people, including two Canadians.
Somalia's al-Qaeda-linked rebel group, al-Shabaab, claimed responsibility for the attack, which specifically targeted non-Muslims. Al-Shabaab said it was retribution for Kenyan forces' 2011 push into neighbouring Somalia.
Here's a closer look at this militant group.
The al-Shabaab Mujahedeen is an armed group of mostly young adherents in Somalia with links to al-Qaeda. Shabaab means "youth" in Arabic.
The group currently operates in southern Somalia, including parts of the capital, Mogadishu.
In 2006, a loosely affiliated group known as the Islamic Courts Union, composed of Sharia court officials and other Islamists, took control of much of southern Somalia, including Mogadishu, from the Transitional Federal Government.
In July, neighbouring Ethiopia, with U.S. backing, invaded Somalia and defeated the ICU forces by the end of 2006.
- Timeline: Al-Shabaab's deadly mission, bitter rivalries
The defeat led to the splintering of the ICU coalition and al-Shabaab was one of two prominent hard-line groups that emerged from the ICU as a separate organization.
At the time, Osama bin Laden and other al-Qaeda leaders were issuing statements about Somalia, including calls for foreign Islamists to go there and fight.
In an interview with The Los Angeles Times in 2008, Sheik Muktar Robow, an al-Shabaab leader and spokesman, said the group was negotiating with al-Qaeda to "unite into one."
He said al-Shabaab would take orders from bin Laden and that, "al-Qaeda is the mother of the holy war in Somalia."
For more on al-Shaabab, you can check out the detailed, 49-page report by Evan Kohlmann for the NEFA Foundation, a counter-terrorism think tank.
In 2010 The Toronto Star carried a feature on Omar Hammami's year in Toronto. The New York Times Magazine followed that with a detailed biography of the young American al-Shabaab leader. The accompanying timeline on Hammami is also worth a look.
Jon Lee Anderson wrote an excellent feature on Somalia in The New Yorker's Dec. 14, 2009 issue (payment required).
The Middle East Quarterly had a substantial look at "The Strategic Challenge of Somalia's Al-Shabaab" in 2010.
The Government of Canada's list of "terrorist organizations," to which al-Shabaab has just been added, is vaguely entitled "Currently listed entities."
Robow went on to say that "most of our leaders were trained in al-Qaeda camps. We get our tactics and guidelines from them. Many have spent time with Osama bin Laden."
Nevertheless, in February 2010, the BBC claimed that al-Shabaab had just "confirmed for the first time that its fighters are aligned with al-Qaeda's global militant campaign."
The story was picked up by many other news organizations.
According to a statement released in December 2007, al-Shabaab is:
"Seeking to establish an Islamic state along the lines of the Taliban-ruled, by-the-law-of-Allah in the land of Somalia; regards the rulers of the Muslim world today as branches of the international conspiracy against Islam, and thus they are to be regarded as infidels and overthrown; [and] seeks to expand the jihad to Somalia's Christian neighbours, with the intent of driving the infidels out of the Horn of Africa, along the same lines as al-Qaeda has been striving to do under the slogan, 'expelling the infidels out of the Arabian Peninsula.'"
The movement's founder was Aden Hashi Ayro, who was killed in a U.S. air strike on May 1, 2008.
In the obituary for their fallen leader, al-Shabaab said that the 1993 battle for Mogadishu was "the first time he fought under the supervision of al-Qaeda." Ayro went on to become a top leader of the Islamic Courts Union, along with Sheik Sharif Sheik Ahmed, the former insurgent who later became president of Somalia, supported by the U.S. government.
The current leader of al-Shabaab, Ahmed Abdi Godane, consolidated his power in June in an internal coup.
At one point, it was thought that Omar Hammami (a.k.a. Abu Mansoor Al-Amriki, "the American"), might assume leadership. He was born in Alabama and, according to news reports, baptized in a Southern Baptist church.
Hammami moved to Toronto in 2004 and married a Somali-Canadian woman during the year he lived in the city.
He played a prominent role in the group's recruitment campaign. But in Sept. 2013, Hammami was shot dead by Godane's allies, the result of an apparent power struggle.
Al-Shabaab is classified as a terrorist organization in Canada, the U.S., the U.K., Australia, Sweden and Norway.
In 2009, CBC News reported federal government suspicions that al-Shabaab may have recruited as many as 30 Somali-Canadians. In 2011 officials said they considered the group the top threat to Canada's national security.
Mohamed Abdullahi Mohamed, a Somali-Canadian who quit al-Shabaab in 2009, said on the CBC program Connect that his nightmare now is that a young man recruited in Canada and trained in Somalia will return "here to carry out a suicide attack."
On March 29, 2010, the RCMP arrested a man on terrorism related charges as he was about to board a plane in Toronto. The RCMP said he was enroute to Somalia, where he intended to join al-Shabaab. On March 7, 2010, the Canadian government added al-Shabaab to this country's terrorist list, following claims that the organization is targeting Canadian youth. The designation came a week after the British government did the same thing.
While the Sept. 21, 2013 attack on Nairobi's Westgate Mall seemed to speak to al-Shabaab's fearsome power, it was "an act of desperation by a jihadi group beset by internal power struggles and plummeting support," according to Ken Menkhaus in a blog post for ThinkProgress.org.
"There is no overt relationship between al-Shabaab and pirate gangs," according to the author of the 2009 book Terror on the Seas: True Tales of Modern Day Pirates.
In an interview with CBC News, Canadian Daniel Sekulich went on to say that despite "diametrically opposed goals, there is suspicion that al-Shabaab may be allowing pirates to operate from their territory in order to gain some income."
Terrorism expert Evan Kohlmann, from the NEFA Foundation, notes that al-Shabaab is "a movement which is cash-hungry and can recognize valuable pragmatic opportunities when they exist."
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