A bomb explodes at the Greek Embassy in Buenos Aires; there are no injuries. Some windows are broken.
Bolivia takes steps to ensure that Ahmad Vahidi, the Iranian Minister of Defence, leaves the country as soon as possible following a complaint from Argentina who believed that he was responsible for the 1994 bombing of a Jewish Community City in Buenos Aires.
Tens of thousands take part in a church-sponsored demonstration against same-sex marriage outside Congress in Buenos Aires, as senators prepare to vote on a bill which would make Argentina the first South American country to legalize same-sex marriage.
Prime Minister of Turkey Recep Tayyip Erdoğan bypasses Argentina on his South American tour, opting to travel straight to Chile after Buenos Aires officials call off an event honouring Mustafa Kemal Atatürk due to what Turkey considers "hostile" interference from Armenian pressure groups.
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..