Turkey's opposition on Sunday worked to keep up the momentum of the protest movement triggered by the arrest of Istanbul's mayor after a giant weekend rally, with a Swedish reporter the latest detained in a government crackdown.

The arrest on March 19 of Istanbul's opposition mayor Ekrem Imamoglu, on corruption charges his supporters say are false, sparked the most significant anti-government protests in Turkey in over a decade in a major test for President Recep Tayyip Erdogan.

After over a week of nighttime street protests, the Republican People's Party (CHP) on Saturday mobilised hundreds of thousands of people for a giant rally in Istanbul calling for the release of Imamoglu, seen as the candidate with the best chance of defeating Erdogan at the ballot box after almost a quarter of a century in power.

With Turkey entering several days of public holiday marking the end of the Ramadan Muslim fasting month, the opposition has vowed to keep up the protest movement while switching tactics to more focused events.

CHP party leader Ozgur Ozel, a former pharmacist who has stepped in as the party's main public flagbearer as........

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