Hundreds of thousands of protesters again congregated in Istanbul Saturday to how their support for the city’s imprisoned mayor and demand his release

Turkish authorities released a lawyer for jailed Istanbul Mayor Ekrem Imamoglu, President Tayyip Erdogan's main political rival, after detaining him overnight, an attorney for the lawyer said on Friday.

Secretary of State Marco Rubio said on Thursday he expressed to Turkish Foreign Minister Hakan Fidan U.S. concerns over the protests and detentions in Turkey following the arrest of Istanbul mayor Ekrem Imamoglu.

More than 1,100 people, including some journalists, were detained in protests against Turkish President Erdogan after the arrest of his rival, Istanbul Mayor Ekrem Imamoglu.

Turkish authorities have detained 343 people during overnight protests in several cities against the detention of Istanbul Mayor Ekrem Imamoglu, the Interior Ministry said on Saturday.

The head of Turkey’s main opposition party has visited jailed Istanbul Mayor Ekrem Imamoglu after six nights of massive protests calling for his release.

Turkish authorities have detained Istanbul Mayor Ekrem Imamoglu, a key rival to President Recep Tayyip Erdogan, as part of corruption and terror investigations, according to state broadcaster TRT, citing the Istanbul Prosecutor’s Office.

His arrest this week has sparked widespread protests across Turkey, with demonstrators rallying in multiple cities to voice their opposition.

A Turkish court jailed Istanbul Mayor Ekrem Imamoglu, pending a trial on corruption charges, in a move likely to cause the country's biggest protests in more than a decade.