Question: What is the name of the person who shot 16 people during a disaster in 1987 in the United Kingdom?

Context articles: Violent and Sex Offender Register
Hungerford massacre
Tan Wah Piow
Operation Spectrum
1987 in the United Kingdom
Erfurt school massacre
Atlantique incident
1989 Alice Springs hot air balloon crash
Bento Rodrigues dam disaster
Great Fires of 1947

In the United Kingdom, the Violent and Sex Offender Register (ViSOR) is a database of records of those required to register with the police under the Sexual Offences Act 2003 (the 2003 Act), those jailed for more than 12 months for violent offences, and those thought to be at risk of offending.
 In response to a Freedom of Information request in 2009, for example, Greater Manchester Police reported that of 16 people in their area placed on ViSOR since 2007 on their initiative and not as a result of a relevant conviction, four (25%) had clean criminal records.
The Hungerford massacre was a series of random shootings in Hungerford, Berkshire, United Kingdom, on 19 August 1987, when Michael Robert Ryan, an unemployed antique dealer and handyman, fatally shot 16 people, before taking his own life.
 The shootings, committed using a handgun and two semi-automatic rifles, occurred at several locations, including a school he had once attended.
 A police officer died in the incident, and many people were injured.
 15 other people were also shot but survived.
 No firm motive for the killings has ever been established, although one psychologist has theorised Ryan's motive for the massacre had been a form of "anger and contempt for the ordinary life" around him, which he himself was not a tangible part of.
Tan Wah Piow () is currently a lawyer and a former Singapore student leader, who since 1976 lives in political exile in London.
 In 1987, he was accused by the Singapore government of being the alleged mastermind behind the Marxist Conspiracy.
 The Government of Singapore arrested 16 people for their role in an alleged Marxist Conspiracy, which involved plans to overthrow the Government to form a Marxist state.
 According to the state media, Tan had been influenced by Marxist and ideas since the early 1970s.
 In response, the government revoked his citizenship in 1987.
Operation Spectrum (), also known as the 1987 "Marxist Conspiracy", was the code name for a covert security operation that took place in Singapore on 21 May 1987.
 16 people were arrested and detained without trial under Singapore's Internal Security Act (ISA) for their alleged involvement in "a Marxist conspiracy to subvert the existing social and political system in Singapore, using communist united front tactics, with a view to establishing a Marxist state."
 On 20 June 1987, six more people were arrested, bringing the total number of detainees to 22.
 The mostly English-educated group was a mix of Catholic lay workers, social workers, overseas-educated graduates, theatre practitioners and professionals.
Events from the year 1987 in the United Kingdom.
 At the beginning of the year, the Archbishop of Canterbury's envoy Terry Waite was kidnapped in Lebanon and remained a hostage until 1991.
 The major political event of this year was the re-election of Margaret Thatcher in June, making her the longest continuously serving Prime Minister since Lord Liverpool in the early 19th century.
 The year was also marked by a number of disasters — the sinking of the ferry MS "Herald of Free Enterprise", the Hungerford massacre, the "Great Storm", the Remembrance Day Bombing and the King's Cross fire.
The Erfurt massacre was a school massacre that occurred on 26 April 2002 at the Gutenberg-Gymnasium in the Thuringia State capital Erfurt, Germany.
 (A German "Gymnasium" is a secondary school similar to a British "Grammar school" or a US "Prep school".)
 The gunman, 19-year-old expelled student Robert Steinhäuser, shot and killed 16 people: 13 staff members, two students, and one police officer, before committing suicide.
 One person was also wounded by a bullet fragment.
The Atlantique Incident was an event in which a Breguet Atlantic patrol plane of the Pakistan Navy's Naval Air Arm, with 16 people on board, was shot down by the Indian Air Force for violating Indian airspace.
 The episode took place in the Rann of Kutch on 10 August 1999, just a month after the Kargil War, aggravating already tense relations between India and Pakistan.
On 13 August 1989, two hot air balloons collided near Alice Springs, Northern Territory, Australia, causing one to crash to the ground, killing thirteen people.
 It was the world's deadliest ever ballooning disaster until February 2013, when a balloon accident near Luxor, Egypt killed 19 people.
 As of July 2016, it remains the deadliest ever ballooning accident in Australia, and the third-deadliest worldwide, surpassed only by the Egypt crash and a balloon accident in Texas in 2016 that left 16 people dead.
The Bento Rodrigues dam disaster occurred on 5 November 2015, when an iron ore tailings dam in Bento Rodrigues, a subdistrict of Mariana, Brazil, suffered a catastrophic failure, causing flooding and at least 17 deaths.
 At least 16 people were injured.
The Great Fires of 1947 were a series of forest fires in the State of Maine in the United States that destroyed a total area of 17188 acre of wooded land on Mount Desert Island and 200000 acre statewide.
 Collectively, the fires killed a total of 16 people.
 This disaster is an important part of the local history of the York County and Mount Desert Island areas.