Question: what is the biggest terrorist attacks by the Islamic terrorist group that started 'war on terror' according to Bush against the southern neighbor of Canada?

Canada's southern border with the United States is the world's longest bi-national land border. Canada (/ ˈkænədə / (listen); French: (kanadɑ)) is a country in the northern part of North America. Its ten provinces and three territories extend from the Atlantic to the Pacific and northward into the Arctic Ocean, covering 9.98 million square kilometres (3.85 million square miles), making it the world's second - largest country by total area and the fourth - largest country by land area. The majority of the country has a cold or severely cold winter climate, but southerly areas are warm in summer. Canada is sparsely populated, the majority of its land territory being dominated by forest and tundra and the Rocky Mountains. It is highly urbanized with 82 per cent of the 35.15 million people concentrated in large and medium - sized cities, many near the southern border. Its capital is Ottawa, and its five largest metropolitan areas are Toronto, Montreal, Vancouver, Calgary and Ottawa. <SEP> the official investigation concluded that it was organized by the same group as the february 2004 moscow metro bombing, as well as two previous terrorist attacks on bus stops in voronezh, southern russia, in 2004. the deaths included the bomber and her accomplice, nikolay kipkeev (kipkeyev), the head of an islamic militant group karachay jamaat from the republic of karachay–cherkessia, as the bomb apparently exploded prematurely while the two were standing in the entrance hall of the metro station. <SEP> the obama administration began to reengage in iraq with a series of airstrikes aimed at isis beginning on 10 august 2014. on 9 september 2014 president obama said that he had the authority he needed to take action to destroy the militant group known as the islamic state of iraq and the levant, citing the 2001 authorization for use of military force against terrorists, and thus did not require additional approval from congress. the following day on 10 september 2014 president barack obama made a televised speech about isil, which he stated "our objective is clear: we will degrade, and ultimately destroy, isil through a comprehensive and sustained counter-terrorism strategy". obama has authorized the deployment of additional u.s. forces into iraq, as well as authorizing direct military operations against isil within syria. on the night of 21/22 september the united states, saudi arabia, bahrain, the uae, jordan and qatar started air attacks against isis in syria. [citation needed] <SEP> On 16 September 2001, at Camp David, President George W. Bush used the phrase war on terrorism in an unscripted and controversial comment when he said, "This crusade – this war on terrorism – is going to take a while, ... " Bush later apologized for this remark due to the negative connotations the term crusade has to people, e.g. of Muslim faith. The word crusade was not used again. It will not end until every terrorist group of global reach has been found, stopped, and defeated." On 20 September 2001, during a televised address to a joint session of congress, Bush stated that, "(o)ur 'war on terror' begins with al-Qaeda, but it does not end there. <SEP> Journalist Yosri Fouda of the Arabic television channel Al Jazeera reported that in April 2002 Khalid Sheikh Mohammed admitted his involvement in the attacks, along with Ramzi bin al-Shibh. Mohammed was also an adviser and financier of the 1993 World Trade Center bombing and the uncle of Ramzi Yousef, the lead bomber in that attack.Mohammed was arrested on March 1, 2003, in Rawalpindi, Pakistan, by Pakistani security officials working with the CIA. The 9/11 Commission Report determined that the animosity towards the United States felt by Mohammed, the principal architect of the 9/11 attacks, stemmed from his "violent disagreement with U.S. foreign policy favoring Israel". He was then held at multiple CIA secret prisons and Guantanamo Bay where he was interrogated and tortured with methods including waterboarding. During U.S. hearings at Guantanamo Bay in March 2007, Mohammed again confessed his responsibility for the attacks, stating he "was responsible for the 9/11 operation from A to Z" and that his statement was not made under duress.