Protests rocked Iran again overnight after a seeming slowdown in recent weeks, with marchers calling for the overthrow of the Islamic Republic, online video posts purportedly showed on Friday.

The marches in numerous cities including Tehran that began on Thursday evening and went on into the night marked 40 days since the execution of two protesters last month. Mohammad Mehdi Karami and Seyyed Mohammad Hosseini were hanged on Jan. 8. Two others were executed in December.