"We are being arrested for speaking out for the rights of farmers," Harsimrat Badal tweeted
Shiromani Akali Dal chief Sukhbir Singh Badal and former Union Minister Harsimrat Kaur Badal were briefly detained while trying to enter Chandigarh on Thursday night while protesting against the new farm laws, a matter over which their party decided to pull out of the BJP-led National Democratic Alliance.
"Arrested for raising farmers' voice, but they won't be able to silence us," Ms Kaur tweeted.
"We are being arrested for speaking out for the rights of farmers, but we are pursuing the truth and our force will not be silenced by this force," she tweeted.
In visuals, the former Union Minister is seen surrounded by police personnel - all of them in masks amid the coronavirus crisis - as the Akali Dal leader's supporters try to shield her.
She was released at 11:30 pm on Thursday.
The Akali Dal on Thursday morning began three separate "kisan marches" against the new farm laws, which they say will harm the interest of farmers and give room for large companies to manipulate them.
Sukhbir Singh Badal was leading a march from Amritsar, while Harsimrat Kaur Badal came from Bathinda.
The third procession by Akali Dal leaders Prem Singh Chandumajra and Daljit Singh Cheema started from Anandpur Sahib.
All the three groups intended to merge in Chandigarh, where they planned to give a memorandum against the farm laws to Punjab Governor VP Singh Badnore.
The Akali Dal, which was the BJP's oldest ally, was the third major NDA member to pull out of the grouping after the Shiv Sena and the Telugu Desam Party (TDP).
Farmers fear the laws will end the price support system or MSP and drive the entry of private players who, they say, will put small and marginal farmers at risk.
Harsimrat Kaur Badal had resigned in protest as the bills were pushed through parliament amid a huge outcry by the opposition and a contentious voice vote.