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.
Iran is reviewing a proposed agreement with the United States to halt the war between the two countries, Iran's Mehr news reported on Tuesday, after US President Donald Trump said talks to reach a deal were continuing.
The World Health Organisation said there have been 321 confirmed cases of Ebola in the Democratic Republic of Congo outbreak and 116 suspected cases, marking a large drop in the number of suspected cases as hundreds were ruled out after investigation.
Israel kept up strikes on southern Lebanon on Tuesday, pressing its campaign against Hezbollah a day after US President Donald Trump asked Israeli Prime Minister Benjamin Netanyahu not to attack Beirut, averting further escalation in the three-month-old war.
Russian drones and missiles pounded the Ukrainian capital Kyiv and other cities early on Tuesday, killing at least 11 people and wounding more than 100, authorities said, following days of warnings about Moscow's plans for a major assault.
Two people died in central Kenya during a protest against a planned US Ebola quarantine facility, a protest organiser told Reuters on Tuesday, as President William Ruto rebuffed criticism it will endanger Kenyans.