The protesters, who spend a chilly night in the open after they fought pitched battle with police throughout the day yesterday, were taken into a bus by police.
Police had also picked up protesters from outside Congress chief Sonia Gandhi's 10, Janpath residence in the wee hours today.
In a surprise move, Gandhi had came out of her residence and met protesters late last night.
According to a protester, Gandhi told them "I am with you. I can't tell when the justice will be delivered, but surely it will be. We will do something."
The protesters when asked for a deadline, she said, "I can't give you a deadline but action will be taken."
The detentions came as part of a police plan to contain protest near Raisina Hill, the seat of power.
Four metro stations near India Gate and Raisina Hill have already been closed from this morning till further orders.
The stations which remained closed were Patel Chowk, Central Secretariat, Udyog Bhavan and Race Course.
