Israeli forces have escalated their attacks in Lebanon against Hezbollah, a U.S.-designated terrorist group, over the last couple of weeks, leading to an increase in the likelihood of an all-out war.

The Israeli military carried out a large number of airstrikes against Hezbollah targets Monday, killing more than 270 people and injuring more than 1,000 others, according to Lebanon’s health ministry. It represents the deadliest day of Israeli attacks there since at least 2006, when Israel last fought an all-out war with the Iran-backed militant group based in Lebanon.