Mini-bin-Laden, playing Taliban bingo,.... B-1...F-16...B-52... !
Kidding aside, it's a close call between a 500lb bomb with its fin assembly unattached and a jettisoned fuel tank. The area between the 2 lift points seems like a fill point, but on an Aluminum or fiberglass fuel tank, the tank would display substantially more damage, especially with the corresponding crater.
Pic isn't necessarily doctored, but probably the one selected of many taken for newsworthiness.
In photographing desert terrain, especially rock and gravel, it's very difficult to get depth of field and discern distance by photography. Ridges aren't obvious. The dscerning factor here which I would use is the size of cobble and rock around the crater, the brown like color of the fresher dirt having ben dug up by the cratering, and the Mini-bin-Laden in the background closer to some boulders of different color. There seems to be a slight brown hue distinguishing the crater ridge line from the anomalous photo.
Also note the damage to the bomb/tank in question. Fuze assembly if a bomb is in the nose or the tail, but note the lift point eyes. normally they're in line or parallel to one another. Looks like it took some significant force to dislodge them. The scarring on the nose without a complete collapse rules out Aluminum. Fiberglass tends to fray and display different scarring patterns. Looks like painted steal to me with a rock or jagged edge having ripped open the outer skin on the front lower portion of the bomb. Perhaps some Comp B exposed.
Scarring of bomb also has slight brown tint as the adjacent cratered soil, not similar to background coloration, so it seems the bomb went slick, cratered, maybe pulled out by locals to remove fuze to make safe. Pure conjecture on my part though.
Then again, it makes good PR for other would be third world terrorists to believe we can lob submarines thousands of miles and land them nearby their civilian living quarters. If the photo isn't from a telephoto lens then I considered possibly a Sono Tube Concrete column being sheared and laying there, but the lift points are very distinctive.
Who knows, they say 5000lb bombs are being used, and if the Arab is lifesize adjacent to the bomb, it would look larger than the 2-man Japanese submarines at Pearl Harbor, or about 10 x the size of a 500 lb bomb.
The second photo leaves little doubt its a 500 lb bomb. Also downslope accounts for the Mini-bin-Laden.