This photo of the second explosion appears to show someone on the roof of a building, this has been pointed to as something suspicious:
http://www.nydailynews.com/news/nat...bombing-prompts-speculation-article-1.1317947
![](https://www.metabunk.org/sk/skitched-20130416-082229.jpg)
However, the building is 755 Boylston, a luxury apartment building, and that area is the common roof deck shared by the apartments:
http://www.warrenre.com/boston-luxury/755-boylston-luxury-back-bay-apartments
![](https://www.metabunk.org/sk/755_Boylston_Luxury_Back_Bay_Apartments-20130416-081304.jpg)
http://www.zillow.com/homedetails/Boylston-St-Boston-MA-02116/2130785392_zpid/
![](https://www.metabunk.org/sk/Boylston_St%2C_Boston%2C_MA_02116_-_Zillow-20130416-081838.jpg)
![](https://www.metabunk.org/sk/600_boylston_st%2C_boston_-_Google_Maps-20130416-081529.jpg)
Hence it's entirely expected that someone would be up on the roof, watching the Marathon. Since this is the second explosion, it's likely they were walking towards the front to see what the noise was, and then the second bomb went off.
http://www.nydailynews.com/news/nat...bombing-prompts-speculation-article-1.1317947
![](https://www.metabunk.org/sk/skitched-20130416-082229.jpg)
However, the building is 755 Boylston, a luxury apartment building, and that area is the common roof deck shared by the apartments:
http://www.warrenre.com/boston-luxury/755-boylston-luxury-back-bay-apartments
![](https://www.metabunk.org/sk/755_Boylston_Luxury_Back_Bay_Apartments-20130416-081304.jpg)
http://www.zillow.com/homedetails/Boylston-St-Boston-MA-02116/2130785392_zpid/
![](https://www.metabunk.org/sk/Boylston_St%2C_Boston%2C_MA_02116_-_Zillow-20130416-081838.jpg)
![](https://www.metabunk.org/sk/600_boylston_st%2C_boston_-_Google_Maps-20130416-081529.jpg)
Hence it's entirely expected that someone would be up on the roof, watching the Marathon. Since this is the second explosion, it's likely they were walking towards the front to see what the noise was, and then the second bomb went off.
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