Citation: http://www.straitstimes.com/breaking-news/world/story/london-marathon-observes-30-second-period-silence-boston-victims-20130421
It is important to show condole with victims.
When I was an elementary school student, I saw my older students offered a silent prayer for victims of Atomic bombing of Hiroshima.
Then, I thought the custom of offering silent prayers was specific to Japan.
But, I realized it's my illusion, when I read the article.