Operation Black Thunder: the 1988 siege of Sri Harmandir Sahib ends in surrender

Who: Punjab Police under Director General K. P. S. Gill, the CRPF and National Security Guard commandos, with the NSG led by Ved Marwah according to The Caravan; and armed Kharku groups, about 30 of them by The Tribune's estimate, who held rooms and buildings in the complex.

What: After Operation Blue Star the groups occupied rooms along the parikarma. The Tribune says one Panthic Committee opened an "office of Khalistan" in room 14 and held press conferences there. A shot fired from inside wounded CRPF DIG Sarabdeep Singh Virk in the jaw as he supervised the demolition of a wall the groups had built outside, and fire was exchanged with the CRPF pickets. The Caravan dates the start of the siege to May 9, and Wikipedia dates the shooting to May 8. Water and electricity were cut and snipers took the high ground. On May 11 NSG commandos took over from the CRPF and cordoned the complex. Sharpshooters pinned down anyone who moved, and the NSG took the outer buildings, among them the SGPC office and Teja Singh Samundri Hall, then the Manji Sahib, Diwan Hall and langar building. Ceasefires and calls to surrender brought many people out.

On May 18 a last batch of 46 who had sheltered in Sri Harmandir Sahib walked out with their hands raised, in daylight and in front of the press, without troops entering the sanctum. Three NSG commandos had been injured. Totals differ: Wikipedia's summary of press reports says about 200 surrendered and 41 were killed. A first operation of the same name had cleared the complex on April 30, 1986, under the Akali government of Surjit Singh Barnala.

Where: The Sri Harmandir Sahib complex, Amritsar.

Why it mattered: Unlike Blue Star in 1984, the state fought this one as a siege in front of the press, and The Caravan says the government wanted to avoid a repeat of the Army assault. The Tribune's retrospective says the surrendered men were later discharged for lack of evidence yet kept in jail by "other means", and that over 40 bodies, some skeletal, were exhumed from debris in the outer complex. Its author argues this exposed the groups as extortionists who had tortured and killed suspected informers.