Israeli tanks forged deeper into eastern Rafah, reaching some residential districts on Tuesday, stepping up an offensive in the southern border city where more than a million people had been sheltering after being displaced in seven months of war. Israel's international allies and aid groups have repeatedly urged against a ground incursion into refugee-packed Rafah, warning of a potential humanitarian catastrophe. Qatar's Prime Minister Sheikh Mohammed bin Abdulrahman Al-Thani said Israel's operations in Rafah have set back efforts at trying to reach a ceasefire in talks that are being mediated by Qatar and Egypt, although it would continue to negotiate.