I can't see where the fellow on the roof was shot, other than in the headline, and I think that is just a problem with Google Translate. And the fellow on the roof would not have a view of either explosion sites.

The bombs were apparently composed of gun powder and "ball bearing-type material," whatever the heck that means. If anyone knows how the bombs were detonated, they're not talking.

Onward and upward,
airforce