TEL AVIV—Israel is expanding its ground operation in southern Lebanon, sending troops into villages farther from its border, in what some former senior security officials worry could turn into a war of attrition.

       On Thursday, Israel’s military for the second day in row said its troops were reaching new targets in southern Lebanon. A day earlier, the military announced six soldiers were killed fighting there, in one of the deadliest single incidents for Israeli troops since the start of the ground operation more than a month ago.

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