• 2017 Orlando shooting
  • A discharged 45-year-old former employee shoots and kills five people at a manufacturing business in Orlando, Florida, United States. The shooter took his own life afterwards. Eight others inside the workplace survived. (CNN) (ABC News)
• 2017 Brighton siege
  • In Brighton, a suburb of Melbourne, Australia, a gunman kills one man and holds one woman hostage before he is shot dead by Victoria Police. The incident is being treated as an act of terrorism. Islamic State in Iraq and the Levant has claimed responsibility for the attack but Victoria Police claim that there is little evidence to suggest a connection. (Aus. Broadcasting Corp.) (Herald Sun)

• 2017 disasters in China
  • Eight people are killed in an explosion at a petrochemical plant in Shandong, China. (Reuters)

• Australia–China relations
  • Reports emerge of the Australian Security Intelligence Organisation's discovery of classified Australian documents, related to Chinese intelligence activity abroad, in the Canberra home of a woman allegedly acting on behalf of the Communist Party of China. (The Sydney Morning Herald)
• 2017 Qatar diplomatic crisis
  • Bahrain, Egypt, Libya, the Maldives, Saudi Arabia, the United Arab Emirates, and the internationally recognized government of Yemen sever diplomatic ties with Qatar, ordering Qatari citizens in those countries to be expelled as well as cutting all land, air and sea connections. "National security," "media incitement" and Qatar's support of Iran are variously cited. (The Guardian) (AP)
  • Iran, Turkey, and the United States call for the sides to peacefully resolve their differences. (Reuters)
• Montenegro–NATO relations
  • Montenegro officially joins NATO as its 29th member at a ceremony in Washington, D.C. (Radio Free Europe/Radio Liberty)

• Russian interference in the 2016 United States elections
  • After The Intercept publishes a classified NSA document describing Russian efforts to launch cyberattacks on U.S. voting software suppliers, the United States Department of Justice announces it had brought charges upon Reality Winner, the alleged leaker. (Reuters)

• 2016–17 Turkish purges
  • The Turkish interior ministry announces that 130 people, living outside the country and suspected of militant links, will lose their citizenship unless they return to Turkey within three months and meet government standards. Named suspects include U.S.-based cleric Fethullah Gülen, and Peoples' Democratic Party leaders Faysal Sariyildiz, Tuğba Hezer, and Özdal Üçer. (Reuters)
• United States withdrawal from the Paris Agreement
  • The chargé d'affaires of the U.S. Embassy in Beijing, China, resigns following President Donald Trump's announcement he will withdraw the United States from the 2015 international Paris Agreement on climate change mitigation. (Reuters)

• GSAT-19
  • Indian Space Research Organisation successfully launches communications satellite GSAT-19 through its heaviest rocket Geosynchronous Satellite Launch Vehicle Mark III. (Times of India)
• Moons of Jupiter
  • Another satellite of Jupiter is announced, S/2017 J 1, just 3 days after the announcement of S/2016 J 1. (Minor Planet Center)
• Apple Worldwide Developers Conference
  • Apple announces iOS 11 in WWDC 2017. (Bloomberg) (9to5Mac)