Tens of thousands of Muslims demonstrated Friday across the Middle East in support of the Palestinians and against Israeli airstrikes pounding Gaza, underscoring the risk of a wider regional conflict erupting as Israel prepares for a possible ground invasion in the coastal strip. From Amman, Jordan, to Yemen's capital of Sanaa, Muslims poured out onto the streets after weekly Friday prayers, angered by the Israeli strikes in a war that began after the militant group Hamas launched an unprecedented surprise attack on Israel last Saturday. At Al-Aqsa Mosque in Jerusalem, Israeli police ha...