The Canadian government has announced USD 139 million in additional aid to address the refugee crisis around the region precipitated by the fighting, in addition to the USD 67 million already committed to Iraq.
Iraq's Prime Minister Haider al-Abadi received Harper in Baghdad. Canada is part of the US-led international coalition supporting the Iraqi military with airstrikes, training and weapons.
Harper pledged to continue his government's support for Iraq.
Al-Abadi hailed Canada's role in that coalition as "essential" and called on the international community to join forces against the extremist threat as "terrorism is not only threatening Iraq, but the region and the whole world."
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Meanwhile today, a suicide car bombing followed by another car bombing minutes later in Baghdad's popular Karrada neighborhood killed at least 17 people, police said. The bombs struck as restaurants and coffee shops were full of people, they said.
In Anbar province, three soldiers and three militiamen were killed and nine were wounded when a suicide car bomber drove an explosive-rigged Humvee into their headquarters in the town of Garma, a police officer said.
Medical officials confirmed the casualty figures. All officials spoke on condition of anonymity as they were not authorized to release the information.
The killings came as the U.N. Mission in Iraq reported that 812 Iraqis, including 277 members of security forces and allied militias, were killed in April.