Serdang MP Teo Nie Ching and Teratai state assemblyperson Jenice Lee, two DAP female politicians, were arrested along with seven party workers at the candlelight vigil which was held outside DAP MP Teresa Kok's office in Seputeh.
The vigil was organised to mark the 'death of democracy' in Perak and all those who were present wore black.
The protesters, who were released on a police bail after being detained for seven hours, were told to report back to the Brickfileds police headquarters today.
When they went there at about 10am, the police told them that they would not be charged.
"The police decided to clear all charges against us, and there is no need for us to be on bail or come back to report in future," Teo told reporters later.