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The US Treasury placed five -based facilitators and financiers on its sanctions blacklist Thursday, as it focuses its attention on the extremist group's network in the country.

The Treasury said Egypt-born Turkish lawyer Majdi Salim and another Egyptian citizen, Muhammad Nasr al-Din al-Ghazlani, acted as financial couriers for Al-Qaeda in Turkey.Ìý

The group, designated by the United States as a terror organisation, "used Turkey-based financial couriers... to facilitate funds transfers on behalf of Al-Qaeda, including providing money to the families of imprisoned Al-Qaeda members," the Treasury said in a statement.

Three Turkish nationals, Cebrail Guzel, Soner Gurleyen, and Nurettin Muslihan, were accused of having helped facilitate Al-Qaeda's network across Turkey and into neighbouring Syria.

Thursday's announcement followed a similar sanctions designation in late July of two Turkey-based "financial facilitators" of and , a jihadist group based in Syria with ties to Al-Qaeda.Ìý

al-Sham, a jihadist group based in Syria with ties to Al-Qaeda.Ìý

Concern has grown in Washington over a potential revival of Al-Qaeda, responsible for the 9/11 attacks on the United States 20 years ago, after US troops withdrew from Afghanistan in August.Ìý

Al-Qaeda had been sheltering in Taliban-held Afghanistan in the late 1990s, and the US invasion in 2001 toppled the extremist regime in a bid to find Al-Qaeda's leaders.

"We will continue working with our foreign partners, including Turkey, to expose and disrupt Al-Qaeda's financial support networks," said Andre Gacki, director of the Treasury's Office of Foreign Assets Control, which announced the sanctions.