Israeli tanks are lining up along the Lebanon border as fears surge over a ground invasion that could lead to an all-out war. It comes as Hamas said an Israeli strike killed its leader in Lebanon on Monday, while another Palestinian militant group said three of its leaders were killed in a strike on Beirut, the first attack within the city limits. Hamas said its leader in Lebanon, Fateh Sherif Abu el-Amin was killed, along with his wife, son, and daughter, in a strike that targeted their house in a Palestinian refugee camp in the southern city of Tyre. Israel’s increasing frequency of attacks …