Hardline Hurriyat Conference leader Syed Ali Shah Geelani was arrested at the Srinagar airport on Wednesday. He was taken to his residence and put under house arrest after his arrival from New Delhi.
The octogenarian separatist leader was in the capital for his routine health check-ups.
"As soon as he stepped out of the airport, the police arrested him. He was taken to his residence, which had a cordon of nearly 30 policemen," said Ayaz Akbar, the spokesperson of the Hurriyat (G).
He said Syed Ali Shah Geelani was scheduled to start a campaign to ask people to boycott the upcoming Lok Sabha elections, but "the government cleverly restricted his movement".
"Geelani was in Delhi to get some important medical tests done, but returned soon to start his anti- poll campaign. As usual, the government has stopped his movement to bar him from doing so. By curbing him from reaching to his people, the government is going against to what they call a democracy. He needs respite from these frequent house arrests," he added.
Syed Ali Shah Geelani has spent most of the time under house arrest since the 2010 street agitations.
As advised by his doctors, he spends most of his winters in Delhi to keep away from the severe cold. He was put under house arrest in New Delhi last year after the hanging of parliament attack convict Afzal Guru on February 9, 2013.