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Despite its ceasefire with Lebanon, Israel has continued to strike what it has said are Hezbollah targets in the country during the truce, while the militant group has said it is attacking Israeli forces in response to continued attacks.

Last week, an Israeli source told CNN that the Israeli military is expanding its operations in Lebanon, including renewing strikes in the capital Beirut, to counter threats by the Iran-backed militant group.

Here’s what to know about Hezbollah:

Origins: Hezbollah emerged from the rubble of Israel’s 1982 invasion of Lebanon, when Israeli forces took almost half of Lebanon’s territory, including Beirut. Israel’s operation resulted in more than 17,000 deaths, according to contemporary reports and an Israeli inquiry into a massacre at the Beirut refugee camp of Sabra and Shatila, one of the bloodiest events in the region’s recent history.

Rise to prominence: A band of Shia Islamist fighters trained by Iran burst onto Lebanon’s fractious political landscape. Eventually, in 1985, militants coalesced more formally around a newly founded organization: Hezbollah. The group made no secret about its ideological allegiance to Tehran and received a steady flow of funds from the Islamic Republic. It became a participant in Lebanon’s civil war, which ended in 1990, and led a fight against Israeli forces occupying southern Lebanon, ultimately driving them out in 2000.

Terror designation: In Lebanon, Hezbollah is officially considered a “resistance” group tasked with confronting Israel, which Beirut classifies as an enemy state. Much of the Western world has designated Hezbollah a terrorist organization.

Battered condition today: Hezbollah, once seen as a potent deterrent against a direct confrontation with Iran, now appears barely a shadow of the force it once was. Battered by years of relentless Israeli assaults, it has seen its most senior leaders assassinated, its southern Lebanese strongholds overrun and its fearsome missile arsenal depleted.

CNN’s Eugenia Yosef and Tim Lister contributed to this reporting.