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Turkish police have detained more than 300 people during the biggest opposition demonstrations in more than a decade, sparked by the arrest of Istanbul’s popular mayor, the Interior Ministry said on Saturday.

Ekrem İmamoğlu, the main challenger to Recep Tayyip Erdoğan, the country’s longtime leader, was taken into custody on Wednesday on corruption and terrorism charges.

Police detained 343 people at protests in Istanbul, the capital Ankara and seven other cities, according to a statement by Ali Yerlikaya, the interior minister.

İmamoğlu denies the charges and his supporters accuse Erdoğan of using the police and judiciary to stymie his political aspirations. The justice minister has denied the investigations are politically motivated and said Turkish courts act independently.

The move against İmamoğlu has thrust the country into political and economic turmoil. It ignited a deep sell-off in Turkish assets that forced the central bank to sell billions of dollars of its reserves to defend the lira as it tries to cool inflation of about 40 per cent.

It has also energised an opposition that has faced a long-running clampdown on free speech and assembly during Erdoğan’s 22 years in power. 

Erdoğan warned the main opposition Republican People’s party, or CHP, that the days of “determining politics with street terrorism are in the past”.

“We will absolutely not allow the CHP and its partisans to disrupt public order with provocations and disturb the peace of our nation,” he said in post on X on Saturday.

The government has largely stamped out mass political protests since 2013, when hundreds of thousands of people took part in demonstrations, called the Gezi Park protests. The crackdown marked a turning point in Erdoğan’s slide towards authoritarian rule.

Protesters in Istanbul, Ankara and the third-largest city of Izmir are defying a ban on public gatherings after the main opposition Republican People’s Party (CHP) called on them to demonstrate peacefully every evening until İmamoğlu is freed.

The protests have been mostly orderly, but on Friday night riot police used tear gas and rubber bullets outside Istanbul’s city hall to stop some demonstrators who attempted to cross a barricade and threw objects at police, according to news reports. Water cannons were deployed in Ankara and Izmir.  

Istanbul’s governor, an official appointed by Erdoğan, on Saturday banned “people, groups or vehicles likely to participate in illegal protests” from entering or exiting the province. The ban on protests was also extended to March 27.

İmamoğlu was brought to Istanbul’s central courthouse late on Saturday. There, he will appear before a judge who is expected on Sunday to decide whether to release him or remand him to custody. İmamoğlu can only be held for four days without charge under the country’s anti-terrorism statutes.

He was detained just days before a CHP primary to name its presidential candidate. The party has said it will go ahead with the nationwide vote on Sunday, inviting both its registered members and non-members to cast ballots. İmamoğlu, who has been Istanbul’s mayor since 2019, is the only candidate.

A general election is not scheduled until 2028 but the CHP said that nominating İmamoğlu now could pressure parliament to call a snap vote. İmamoğlu has consistently outperformed Erdoğan in opinion polls, with voters unhappy with the president’s handling of the cost of living crisis.

Erdoğan is precluded from running again by term limits, but his allies have called for the constitution to be amended so that he can stand again and extend his rule into its third decade.

President Trump has announced that Boeing will build the U.S. Air Force’s next generation of fighter jets.

“They will have unprecedented power,” Trump said on Friday, adding that “America’s enemies will never see [them] coming.”

Trump is the 47th U.S. president and the jet is being called the F-47.

“The generals picked a title, and it’s a beautiful number,” Trump told reporters from the Oval Office. “Nothing in the world comes even close to it.”

Known as the Next Generation Air Dominance, or NGAD, the F-47 will join a legacy of high-performance jets, though little is known about its exact specifications, appearance or capabilities. Trump teased that the sixth-generation fighter aircraft would be “virtually unseeable” on radar.

Although details on the contract’s cost remain unclear, early estimates suggest development costs will exceed $20 billion, according to The Associated Press, while the final price tag would be in the hundreds of billions, The War Zone reported.

“We’ve given an order for a lot. We can’t tell you the price,” Trump said.

The announcement is a big win for Boeing, which has struggled to recover from a series of public relations crises and operational setbacks. The company’s reputation has taken a hit after 737 Max crashes in 2018 and 2019, a door plug blowout in 2024, and longstanding problems with its KC-46 refueling tanker program.

The F-47 will be built at a Boeing manufacturing space in St. Louis, according to St. Louis Public Radio.

Boeing’s stock rose by about 5% on Friday, shortly after Trump’s announcement.

Its largest competitor, Lockheed Martin, saw its shares drop nearly 7%.

Lockheed Martin produces the F-35 jet, which still forms the backbone of the Air Force’s air combat capabilities. But the F-35’s have faced criticism — notably from Trump ally Elon Musk, who has called the F-35 an “expensive & complex jack of all trades, master of none.”

Musk has instead called on the U.S. Department of Defense to invest more in drone technology in lieu of stealth jets.

Secretary of Defense Pete Hegseth said the new warplanes would send a strong message about America’s commitment to remaining a global leader in military aviation.

The new fighter jet, he said, “sends a very clear, direct message to our allies that we’re not going anywhere.”