The move was taken in coordination with the United States.

The British sanctions target Zuheir Shamlakh, a man known as Hamas's "main money changer", and a key figure involved in the group's shift towards cryptocurrencies who helped transfer large sums of money from Iran to Hamas ahead of the group's Oct. 7 attacks on Israel, Britain's foreign office said.

"These sanctions send a clear message to Hamas - the UK and our partners are committed to ensuring there is no hiding place for those financing terrorist activities," British Foreign Secretary David Cameron said.

The sanctions also target a senior official of Palestinian Islamic Jihad, another militant group.

(Reporting by Kylie MacLellan, writing by Sachin Ravikumar; editing by William James)