Now, what were these Islamists really wielding? The AK-series of weapons? A combination of types? Pakistan is a known licensed producer (and possible exporter) of Heckler & Koch weapons and while the weapons are not easily available to terrorists, terrorists have been known to wield them. If Heckler & Koch weapons were used, I would expect some implications as to their origins.
There is another possibility that the AP photo was mislabelled, with those weapons belonging to that of the paramilitary.