Balanced on a steep slab of fissured concrete with rods of twisted metal poking out and the remnants of a dome slanted at a 45-degree angle behind him, a young muezzin in a baseball cap called Muslims to prayer from atop a bombarded mosque in Gaza. The minaret, where the muezzin would usually stand, was still upright but appeared precarious, with a chunk missing from the balustrade at the top and the base resting on the jumbled ruin of the Al-Touba Mosque in Khan Younis in the southern Gaza Strip. The mosque is one of many in Gaza that have been hit by Israeli strikes in its war against Hamas.