Several thousand Turkish students protested on Tuesday in Istanbul and Ankara, reviving demonstrations after the March 19 arrest of Istanbul's opposition mayor Ekrem Imamoglu by authorities.
The campaign of protests -- the biggest to grip Turkey since 2013 -- had dipped over the past 10 days with the closure of universities and celebrations marking the end of Ramadan.
On the Asian side of Istanbul, several thousand students were seen rallying in images broadcast by Turkish media, which also showed a major police deployment.
In the capital Ankara, hundreds of university students also marched, according to media reports and images shared on social media that were verified by AFP.
Imamoglu is the chief political rival to President Recep Tayyip Erdogan. His detention last month set off the wave of mass protests that the government has robustly cracked down on, arresting nearly 2,000 people, including hundreds of students.
The opposition CHP party made Imamoglu its candidate for the 2028 presidential election.
It has also encouraged a boycott movement against companies and businesses seen close to the Turkish government.
CHP leader Ozgur Ozel is seeking to have more protests spiring up in different Turkish cities, and called for another mass demonstration late Wednesday in Istanbul.