Authorities in India's capital, New Delhi, transferred social activist Sonam Wangchuk to a hospital after his health deteriorated on the 21st day of a hunger strike demanding the resignation of the country's education minister.

Wangchuk, 59, has been on a fast since June 28 in solidarity with the youth-led Cockroach Janta Party (CJP), which is calling for Education Minister Dharmendra Pradhan to resign following exam paper leaks in May that affected millions of students.

His protest has become one of the most prominent public challenges to Prime Minister Narendra Modi's government, attracting widespread support across India and generating millions of views and shares on social media.

Television footage on Saturday showed dozens of police officers and security personnel, both in uniform and plainclothes, arriving at the protest site. They held up large white cloth sheets around the stage before authorities escorted Wangchuk away.

He was not visible in the broadcast footage.