By Nidal al-Mughrabi and Bassam Masoud GAZA/CAIRO (Reuters) – Israeli tanks were trying to push further west in their battle against Hamas in and around Khan Younis on Monday, as they met resistance amid intense combat in a war that has now entered its third month and with no end in sight. The fighting in Khan Younis, the main city in the southern Gaza Strip with a population of around 626,000 including people displaced by Israeli bombing in the north, comes as Israel refocused its war effort to the south. Amid reports of a “catastrophic” health situation in Gaza from the World Health Organiza…