Turkish authorities detained several journalists from their homes, a media workers' union reported Monday, in what it said was a crackdown amid escalating protests triggered by the imprisonment of the mayor of Istanbul and top rival to President Recep Tayyip Erdogan.

On Sunday, a court formally arrested Mayor Ekrem Imamoglu and ordered him jailed pending a trial on corruption charges. His detention on Wednesday sparked the largest wave of street demonstrations in Turkey in more than a decade and deepened concerns over democracy and the rule of law in the country.

U.S. and Russian negotiators on Monday sat down for talks in Saudi Arabia on a partial ceasefire in Ukraine, hours after a round of negotiations between U.S. and Ukrainian delegations, Russian news reports said.

The state Tass and RIA-Novosti news agencies said the negotiations had begun in the capital Riyadh. The meeting is expected to be followed by another contact between U.S. and Ukrainian teams.

Donald Trump's Middle East envoy Steve Witkoff said the U.S. president was trying to head off armed conflict with Iran by building trust with Tehran.

Sudan 's military said Friday it retook the Republican Palace in Khartoum, the last heavily guarded bastion of rival paramilitary forces in the capital, after nearly two years of fighting.

The seizure of the Republican Palace, surrounded by government ministries, represents a major symbolic victory for Sudan's military against the paramilitary Rapid Support Forces. However, it likely doesn't mean the end of the war as the RSF holds territory in Sudan's western Darfur region and elsewhere.

Ukraine is hoping to secure a partial ceasefire at upcoming talks in Saudi Arabia during which U.S. officials will meet separately with Russian and Ukrainian representatives, a senior Ukrainian official told AFP on Friday.

"We still want to agree on a ceasefire, at least on what we have proposed," the source said, referring to a Russian and Ukrainian halt on strikes on energy sites, civilian infrastructure and attacks in the Black Sea, adding that the Ukrainian delegation on Monday would be led by Defence Minister Rustem Umerov.

Flights to and from London's Heathrow Airport were canceled Friday after a fire at a nearby substation knocked out power to Europe's busiest airport, disrupting travel plans for hundreds of thousands of people around the world.

Here's a look at what's happening and its impact on air travel.

President Donald Trump 's executive order to facilitate the closure of the U.S. Education Department is met with protests and court challenges. Elon Musk focuses his attention on the Pentagon, where Defense Secretary Pete Hegseth said on social media that the billionaire cost-cutter will discuss "innovation, efficiencies & smarter production." Leaders at dozens of universities facing Trump administration investigations scramble to distance themselves from a nonprofit that helped Black and Latino students pursue business degrees. And the arrests of Canadian and European visitors at U.S. borders has some saying no one is safe to come to America as a tourist anymore.

Here's the Latest:

President Recep Tayyip Erdogan on Friday said Turkey would not be cowed by "street terror" after days of widespread protests over the detention of Istanbul's powerful opposition mayor, Ekrem Imamoglu.

"Turkey will not surrender to street terror," Erdogan said, as the main opposition CHP called for nationwide protests later on Friday.

Ukrainian President Volodymyr Zelensky on Friday urged "joint pressure" on Moscow after it launched a "massive" overnight aerial attack, firing 214 drones and several guided bombs at cities across Ukraine.

"It is joint pressure on Russia, along with tougher sanctions and stronger defense support for our country, that paves the way to ending this kind of terror and Russia's prolongation of the war," Zelensky said in a post on social media.

A federal judge on Thursday ordered immigration officials not to deport a Georgetown scholar who was detained by the Trump Administration and accused of spreading Hamas propaganda in the latest battle over speech on U.S. college campuses.

U.S. District Judge Patricia Tolliver Giles in Alexandria, Virginia, ordered that Indian national Badar Khan Suri "shall not be removed from the United States unless and until the Court issues a contrary order."