The leaders of the world's twenty largest economies meet in Canada at the 2010 G-20 Toronto summit.
Moderna begins testing its vaccine in babies and children aged six months to 11 years in the U.S. and Canada.
The United Kingdom and United States governments announce they have agreed to protect the wreckage of the RMS "Titanic". The agreement, signed by the British government in 2003, has come into effect after being ratified by U.S. Secretary of State Mike Pompeo. An official also says the UK will work with Canada and France to bring "even more protection" to the wreckage.
United States tariffs of 25% on steel and 10% on aluminium imports from Canada, Mexico and the European Union are set to take effect at midnight.
Both Starwood Hotels and Resorts Worldwide and Marriott International shareholders approve Marriott's acquisition of Starwood, which will create the world's largest hotelier. The deal has cleared the pre-merger antitrust reviews in the United States and Canada; approvals from the European Union and China is pending. Last week, Anbang Insurance Group topped Marriott's bid, then withdrew their offer three days later.
Canadian police begin a manhunt for suspected murderer Luka Rocco Magnotta, who is believed to have dismembered a man and mailed his severed hand and foot to political party offices in Ottawa.
Environmentalists, citing greenhouse gas emissions and risks of oil spills, including climatologist James Hansen are arrested outside the White House in Washington D.C. in a protest to urge President Barack Obama to reject TransCanada Corp.'s $7 billion proposed Keystone Pipeline extension from the Athabasca Oil Sands in northern Alberta in Canada to the US Gulf Coast.
Italian police seek to arrest 41 alleged members of the 'ndrangheta crime syndicate based in Calabria with suspects also sought in Germany, Canada and Australia.
The wreck of the 19th century Royal Navy ship HMS Investigator is found in Mercy Bay in northern Canada.
The 36th G8 summit opens in Huntsville, Ontario and the 4th G20 summit is held in Toronto, Canada.
A Toronto man is charged with possessing explosives alleged to be part of a plot to bomb the 2010 G-20 Toronto summit in Canada.