The protesters were attempting to approach the Parliament House in Red Zone, an area which is heavily restricted and houses all major government establishments in the federal capital including the diplomatic enclave.
Police resorted to baton-charging and fired tear gas canisters to disperse the demonstrators as a result of which several persons fell unconscious.
The resultant clash also left six police personnel - two women and four men - wounded.
Footage on TV showed a defiant Januja being bundled into a police van as a woman constable hurled blows on her.
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The police also tried to restrict media from covering the event.
Television channels aired footage of several journalists who were wounded and had their equipment damaged due to the use of force by security personnel.
The police began to target the media persons when they gathered around Janjua, to grab footage of police personnel manhandling and forcing the human rights campaigner into a vehicle.