During rallies in the nation's capital, Delhi, members of the largest opposition party in India have been imprisoned.
On Wednesday, several people were arrested, including MP Manish Tewari.
They were protesting Sonia Gandhi, the leader of the Congress party, being questioned by a government organization that looks into financial crimes.
While taking part in the demonstrations on Tuesday, her son and party leader Rahul Gandhi were taken into custody by the police. Later, he was freed.
The accusation against Mrs. Gandhi and her son is that they utilized the organization's party funds improperly to purchase priceless real estate through a complicated financial transaction.
The Gandhi refutes the claims.
They claim that the federal law enforcement organizations are being exploited for political vengeance by the ruling Bharatiya Janata Party (BJP).
Mrs. Gandhi had been questioned about the subject three times before this.
Gandhi and other party members were sitting on a road in Delhi before he was arrested on Tuesday, protesting against everything from inflation to the alleged targeting of opposition leaders. They were encircled by hundreds of police officers.
He and many other people were brought on a bus to a detention facility after approximately an hour.
Rahul Gandhi was questioned by the ED in the same case for almost 50 hours over a five-day period in June. Initially summoned for interrogation at the same time, Mrs. Gandhi had to wait after testing positive for Covid-19.
After being brought to the hospital, the 75-year-old leader was eventually released in June.
Mrs. Gandhi is being questioned by a federal law enforcement agency for the first time at this time. Leaders of the Congress party have accused the BJP of abusing federal institutions to settle political scores, but the BJP has refuted these claims.
A BJP MP named Subramanian Swamy filed the lawsuit against the Gandhis, alleging that they had misappropriated party funds to acquire the company that published the now-defunct National Herald newspaper.
What is at issue in the National Herald case?
Jawaharlal Nehru, Rahul Gandhi's great-grandfather and the nation of India's first prime minister, founded the National Herald newspaper in 1938.
Associated Journals Limited (AJL), which was established in 1937 with 5,000 more freedom fighters as its stockholders, published the journal.
Nehru gave up his position as the newspaper's board chairman in 1947 to assume the position of prime minister.
But the philosophy of the publication was still greatly influenced by the Congress party. The newspaper, which was still supported by the Congress party, employed some of India's most well-known journalists.
In 2008, the publication stopped publishing due to financial difficulties. It was resurrected as a digital journal in 2016 and is now regarded as Congress' official spokesperson.
Mr. Swamy claims that Gandhi's attempted to purchase real estate properties worth more than 20 billion rupees ($250 million; £208 million) in a number of cities, including Delhi and Mumbai, by using Congress party finances and taking control of AJL.
It is a "weird example of suspected money laundering without any money," according to the party, which has rejected this.
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