Viewers in the u. S. And Around The World. Im Amara Walker in atlanta, Jim Sciutto is in Tel Aviv as we continue they will follow Breaking News out of The Middle East. And fears are continuing to grow that the exchange of fire across the border between Israel And Lebanon could turn into a Ground Incursion and potentially an even wider regional war thats right. It would be quite a step. Us officials say that israeli troops have mobilized at israels northern border in preparation, at least for a possible Ground Offensive inside Lebanon Israel says, however, the crossing the border is only one option. It is considering we need to understand theres a huge amount of different tools that we have in our Toolbox Ground operations is one of them. We are preparing for that if it is required, if were we receive the instructions well, it would be quite a significant tool. The idf has not let up its Air Offensive inside lebanon. Lebanese officials say four people were killed in an israeli airstrike