The US Treasury Department announced it had imposed sanctions on senior Muslim Brotherhood official Mahmoud al-Abyari, whom it accuses of providing financial support to Hamas. Al-Abyari was identified as a figure living in the UK who serves as the group's Secretary-General.
The Treasury Department's Office of Foreign Assets Control (OFAC) stated that al-Abyari has held senior leadership positions within the Muslim Brotherhood for years. The department alleged that al-Abyari supported fundraising activities for entities previously sanctioned for their Hamas links and, together with Muslim Brotherhood groups, provided financial assistance to Hamas.
The sanctions also target three individuals and three entities said to have provided material support to Hamas. OFAC claimed that two of these entities operated as fake charities linked to the Muslim Brotherhood and transferred significant funds to Hamas's military wing.
The US Treasury Department stated that this step exposed a transnational financing network in which Muslim Brotherhood-linked entities and Hamas-affiliated front organizations raised, moved, and concealed funds across multiple countries using charities and underground banking systems.
These sanctions build on previous US measures in January and March 2026 that targeted Hamas's global financial network. Those earlier measures covered financial facilitators, operatives, and organizations accused of supporting Hamas.
The Treasury Department announced that al-Abyari was added to the sanctions list under the amended Executive Order 13224 on the grounds that he acted on behalf of the Egyptian Muslim Brotherhood, which the US designated as a Specially Designated Global Terrorist organization in January 2026.
The operation was conducted in coordination with the Federal Bureau of Investigation (FBI), the Drug Enforcement Administration (DEA), and US Customs and Border Protection (CBP). The Treasury Department noted that these agencies helped identify key components of Hamas's alleged financial infrastructure.
