Things that happen today, or happened on this day in history...
1. It's Patriots' Day
2. It's Tax Day
3. It's the anniversary of the start of the Civil War (when Lincoln sent troops to stop an armed insurrection)
4. It's the anniversary of Abraham Lincoln's death
5. It's the 100th birthday of North Korea's founder
6. Two security guards were murdered in Massachusetts, and italian anarchists Sacco and Vanzetti would be executed for it amid much controversy.
Also, in 5 days or so, it's the anniversary of Columbine, Virginia Tech, and Hitler's birthday.
For what it's worth, it was already April 16th in North Korea by the time of the explosions. So they did not occur on Kim Il-sung's birthday.