Its certainly not photoshopped, theres photos and video from the area that you can see massive amounts of blood on the sidewalk and the hospitals are reporting a lot of the injuries being blown off limbs.

as far as it being al Qaeda related, i don't think so, the would of done alot more damage than that, however i wouldn't be suprised for it to be a nut group.

"Death is the answer to all problems. No man, no problem."

"I'd rather be hated for who i am, than loved for who i am not"