Why Just The Boston Bombings?

From the White House:

HONORING THE VICTIMS OF THE TRAGEDY IN BOSTON, MASSACHUSETTS
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BY THE PRESIDENT OF THE UNITED STATES OF AMERICA
A PROCLAMATION

As a mark of respect for the victims of the senseless acts of violence perpetrated on April 15, 2013, in Boston, Massachusetts, by the authority vested in me as President of the United States by the Constitution and the laws of the United States of America, I hereby order that the flag of the United States shall be flown at half-staff at the White House and upon all public buildings and grounds, at all military posts and naval stations, and on all naval vessels of the Federal Government in the District of Columbia and throughout the United States and its Territories and possessions until sunset, April 20, 2013. I also direct that the flag shall be flown at half-staff for the same length of time at all United States embassies, legations, consular offices, and other facilities abroad, including all military facilities and naval vessels and stations.  http://www.whitehouse.gov/the-press-office/2013/04/16/presidential-proclamation-honoring-victims-tragedy-boston-Massachusetts
The bombings did not occur on Federal land.
There have been numerous fires, shootings and other violence that have killed more than 3 people.
Why haven't these incident's merited Obama's intervention and had flags flown at half staff?
We have had many soldiers and a diplomat die in the past several weeks and no flags ordered at half staff.
Why?
One thing I have noticed is that the media is going ga ga and drooling over Obama and the bombings.  They are telling us how he is engaged in the issue, how he is leading the investigation and trying to show us he is a leader while making very stupid speeches on the subject.
I suspect the vast majority of Americans would rather we catch the thug(s) that did this than listen to Obama. But Obama is trying to make this about him.  So far, the investigation and Obama has been a failure.
It will be interesting to see if Obama issues a proclamation regarding the Texas tragedy when dozens of people may have died and hundreds injured.
So, why Boston and not other incidents where more people have died?