View of a Hezbollah tunnel that crosses from Lebanon to Israel, on the border between Israel and Lebanon in northern Israel, on July 7, 2019.

WATCH: Inside Hezbollah tunnels in south Lebanon

Hezbollah, like Hamas in Gaza, has dug extensive underground fortifications and prepared bunkers for attacking Israeli communities, holding hostages, and engaging the IDF for prolonged periods.
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Biden rules out imposing arms embargo on Israel

Biden administration says Israel only partially in compliance with demands to expand entry of Gaza aid and end isolation of northern Gaza, but indicates no arms embargo will be imposed.