According to reports, Shah was taken into custody by the police from the New Delhi airport soon after his arrival in the Indian capital to meet Prime Minister's Advisor on Security and Foreign Affairs Sartaj Aziz.
Read: 'Pakistan will call off talks if India blocks Hurriyat meeting'
The Pakistani High Commission in New Delhi had invited Hurriyat leaders to a reception in honour of Aziz on Monday.
Earlier, addressing the media in Srinagar, Shah stated that talks between Pakistan and India must go on as per schedule, despite the ongoing tensions on both sides of the Line of Control (LoC).
Meanwhile, veteran Hurriyat leader Syed Ali Gilani continues to remain under house arrest in Srinagar.
Read: Pakistan snubs India's 'advice' against meeting Hurriyat
Further, the Indian police have also arrested Hurriyat leaders Muhammad Yousuf Naqash, Syed Bashir Andrabi and Mir Hafeezullah in Srinagar.
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