Besides Farooq Abdullah, his son Omar and PDP chief Mehbooba Mufti, as well other senior politicians of the Valley, are under detention since August.
Those detained in Kashmir include ex-CMs Farooq Abdullah, who is a sitting MP from Srinagar, Omar Abdullah, and Mehbooba Mufti.
Satya Pal Malik oversaw a controversial period as the Governor of J&K, during which the central government abrogated Article 370.
IGP SP Pani said several persons have been arrested from different parts of the Valley including Srinagar.
India on August 5 withdrew Jammu and Kashmir's special status and bifurcated the state into two Union Territories.
The Chair of the Labour Party, Ian Lavery, issued a letter to stress that Kashmir is a 'bilateral matter' for India and Pakistan and that the party is opposed to external interference over the issue.
Pierce said that there are a lot of other issues going on in the world and each month the Presidency picks a few that are not routinely scheduled.
The survey also mentions fears over political instability, power crisis, dengue outbreak among other issues.
Pakistan has been trying to internationalise the Kashmir issue but India has asserted that the abrogation of Article 370 was its "internal matter".
Seeking access of foreign journalists and Congressmen to Kashmir, US lawmakers write to Indian envoy
The lawmakers said that true transparency can only be achieved when journalists and Members of Congress are allowed free access to the region.
The US has also sought immediate release of all political detainees in Kashmir as it asked Pakistan to take 'sustained and irreversible' steps against militants.
The latest letter exchange over issue of Kashmir in the UK comes as Labour Party leader Jeremy Corbyn issued his response to another letter issued on behalf of over 100 British Indian organisations.
In an indirect reference, India said that Pakistan has a penchant for deviating from the subject being deliberated upon in this august forum.
The briefing held on Wednesday took place amidst growing concern among US lawmakers on the curbs in Kashmir, several of which have been removed.
The delegation comprises MPs from across the party lines, including Shashi Tharoor, Kanimozhi Karunanidhi, Wansuk Syiem, Ram Kumar Verma and Sasmit Patra.