Qatar Finance Minister Ali Sharif Al-Emadi was arrested for questioning over allegations of embezzlement, abuse of power and crimes related to the public sector, a statement carried by state news agency QNA said on Thursday.
An investigation is underway, the statement added.
Emadi has been minister of finance since 2013 and sits on the board of its powerful $300 billion sovereign wealth fund, the Qatar Investment Authority.
He is also chairman of the board of directors of Qatar National Bank.
Emadi steered Qatar's economic policies during the 2014-2015 oil price crash that prompted the country to accelerate plans to diversify the economy.
He was named as 2020’s best minister in the region by The Banker, an international financial magazine that organises an annual celebration of finance ministers.
Qatar, which next year will host the FIFA World Cup, has invested heavily in infrastructure over the past few years ahead of the event, which means spending on major projects is set to decrease this year, the finance ministry has said.
At least 91 Palestinians were killed and dozens wounded in airstrikes across Gaza on Thursday after Israel resumed bombing and ground operations, the enclave's health ministry said, effectively ditching a two-month-old ceasefire.
US President Donald Trump will sign a long-anticipated executive order on Thursday that aims to shut down the Department of Education, acting on a key campaign pledge, according to a White House summary seen by Reuters.
The Israeli military said on Wednesday its forces resumed ground operations in the central and southern Gaza Strip, as a second day of airstrikes killed at least 48 Palestinians, according to local health workers.
US President Donald Trump and Ukrainian President Volodymyr Zelenskyy agreed on Wednesday to work together to end Russia's war with Ukraine, in what the White House described as a "fantastic" one-hour phone call.
Serbia's parliament formally accepted the resignation of Prime Minister Milos Vucevic on Wednesday, triggering a 30-day deadline for the formation of a new government or the calling of a snap election.