01 Apr 1979 – Iran: Iran voted by national referendum to become an Islamic Republic and to approve a new democratic-theocratic hybrid constitution whereby Sayyed Ruhollah Musavi Khomeini who was an Iranian religious leader and politician became Supreme Leader of the country, in December 1979.
02 Apr 1982 – Argentina/United Kingdom: Argentinean military forces invade the United Kingdom islands known as the Falkland Islands. The Argentinean forces surrendered on the 14 Jun 1982.
02 Apr 2003 – Philippines: JI explodes bomb on crowded passenger wharf killing 16 and injuring 55.
02 Apr 2001 – Gaza Strip: PIJ official Muhammad ‘Abd al-ll’al killed in Israeli rocket attack.
03 Apr 2011 – Pakistan: Suicide bombers attack Sufi shrine in Dera Ghazi Khan killing 50 and injuring more than 100; TTP claims responsibility.
06 Apr 2001 – United States: Algerian Ahmed Ressam convicted for role in in plot to attack Los Angles International Airport on 31 Dec 1999.
11 Apr 1968 – Syria: Popular Front for the Liberation of Palestine – General Command founded.
14 Apr 2014 – Nigeria: More than 250 schoolgirls kidnapped by Boko Haram attack in Chibok; the groups leader, Abubakar Shekau, claims responsibility
14 Apr 2013 – Bahrain: Several devices explode in and around Manama; members of the 14 February Youth Coalition claim responsibility on social media sites.
14 Apr 1986 – Libya: US planes bomb Tripoli and Benghazi in retaliation for Belle disco bombing on the 4 Apr.
15 Apr 15 – United States: Three killed, 264 injured when bomb explodes at Boston Marathon; Djokhar Tsarnaev arrested, Tamerlan Tsarnaev killed in manhunt.
15 Apr 2011 – Indonesia: Twenty-eight injured in Jakarta in country’s first suicide bombing inside a Mosque; no claim of responsibility.
Dates are taken from the NCTC terrorist calendar and 361 Security Significant dates.