At 2:50 p.m. on Monday, a week after the Boston Marathon bombings, President Obama will observe a moment of silence in honor of the victims.

It will come exactly a week after the moment when two bombs exploded at the marathon finish line, killing three people and injuring more than 170. Boston Mayor Tom Menino and Massachusetts Gov. Deval Patrick are observing a moment of silence and asking the public to join them.

Obama's observance will not only be silent, but also will be unrecorded -- it is closed to the media.