The fight against Islamist militants in the southern city of Marawi began with an attempt to capture Isnilon Hapilon on 23 May.
That triggered a rampage by the militants – backed by some foreign fighters – and parts of the mainly Muslim city were seized.
The president of the Philippines, Rodrigo Duterte, declared martial law in Marawi and the entire southern region of Mindanao.
The resulting offensive was intended to crush what Mr Duterte said was an attempt to establish a province in the area.
General Carlito Galvez said Hapilon had not been seen in the battle zone.