The United States has warned Iran of 'serious consequences' if it attacks Israel, as fears of a regional war escalate. Thousands of American troops are being sent to the region, along with fighter jet squadrons and aircraft carriers. Israel has launched ground raids on Hezbollah in southern Lebanon, prompting retaliatory rocket attacks. The Biden administration is urging Israel to keep its incursion limited in scope to avoid a broader war. Israel has also assassinated several top commanders of Hezbollah in recent days.