Stuart Webb works for Channel 4 News in the UK. Today he tweeted this picture of what's been identified as a US Mk 84 "Hammer" bomb outside the gates of a UNWRA distribution warehouse in Gaza.
The Mk 84:
The Mark 84 is capable of forming a crater 50 feet (15.2 m) wide and 36 ft (11.0 m) deep. It can penetrate up to 15 inches (381.0 mm) of metal or 11 ft (3.4 m) of concrete, depending on the height from which it is dropped, and causes lethal fragmentation to a radius of 400 yards (365.8 m).
Many Mark 84s have been retrofitted with stabilizing and retarding devices to provide precision guidance capabilities. They serve as the warhead of a variety of precision-guided munitions, including the GBU-10/GBU-24/GBU-27 Paveway laser-guided bombs, GBU-15 electro-optical bomb, GBU-31 JDAM and Quickstrike sea mines.
The fuzes and tail assemblies vary which would account for the lack of fins in the picture. It appears to be next to an impact site. If this was the landing site and had the bomb exploded, the UN facility would have been taken out.