The Biden administration is concerned the fragile ceasefire in Lebanon could unravel after Israel and Hezbollah exchanged fire in recent days, U.S. officials say. Why it matters: The ceasefire announced last Tuesday ended more than a year of fighting between Israel and Hezbollah.

The bursts of violence — with no reports of serious casualties — reflected the uneasy nature of the ceasefire that otherwise appeared to hold as Lebanese troops began to deploy in parts of southern Lebanon.

The Israeli military says Hezbollah has fired into a disputed border zone, the group's first attack since a ceasefire took hold last week