Authorities arrested Ashiqul Alam who allegedly planned to attack Times Square in New York City with grenades, guns and a suicide vest.
A motorist opens fire and attempts to breach the perimeter of Naval Air Station Corpus Christi in Texas, injuring a security guard, before being shot and killed. FBI officials determine the incident to be terrorism-related and say a second person of interest may be at large. The shooter is later identified as a Syria-born man who expressed support for ISIS and Al-Qaeda in the Arabian Peninsula.
A terrorist mass stabbing at London Bridge kills two civilians and injures three others. The attacker, Usman Khan, wearing a fake explosive belt, is shot dead by police on the bridge. Khan was a former prisoner convicted of terrorism offences, and had links to Islamist terrorist groups.
"Salvator Mundi", a painting generally attributed to Leonardo da Vinci, is sold at auction Christie's in New York City for US$450.3 million; setting a new record for the sale of an original work of art.
Islamic State militants attack two gas facilities northwest of Kirkuk in northern Iraq, killing at least five people and wounding six policemen. Three assailants detonated their explosive vests and a fourth was killed in clash with security forces.
A Carolinian Amtrak passenger train (running north from Charlotte, North Carolina, to New York City) hits a tractor-trailer in Halifax, North Carolina resulting in two cars of the train derailing with several people receiving minor injuries.
The Dow Live Earth Run for Water started on April 18th. The host cities are: Buenos Aires, Cape Town, Chicago, Hong Kong, Jimbaran, London, Los Angeles, Manchester, Melbourne, Mexico City, Milan, Minneapolis, New York, Lisboa, Rio de Janeiro, São Paulo, Singapore City, Stockholm, Toronto and Washington, D.C..