By Ece Toksabay and Huseyin Hayatsever ANKARA (Reuters) -Turkish authorities released a lawyer for jailed Istanbul Mayor Ekrem Imamoglu, President Tayyip Erdogan's main political rival, after detaining him overnight,

To pressure President Recep Tayyip Erdogan over the jailing of his top rival, the opposition wants Turks to boycott companies that back Mr. Erdogan and plans to organize a protest this weekend.

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.

Istanbul's opposition-run municipal council on Wednesday elected an interim mayor to run the city, after mayor Ekrem Imamoglu was jailed pending trial over graft charges that he and his supporters deny and call politicised.

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.

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.

Supporters of the mayor, Ekrem Imamoglu, said that corruption charges against him were a ploy to hobble the main political rival of President Recep Tayyip Erdogan.

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

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