BEIRUT, Lebanon — Lebanon's powerful Hezbollah guerrilla movement _ widely seen as the Arab world's most effective force against Israel _ is a staunch Hamas supporter but has so far held its fire as its Palestinian ally faces down Israel's assault in Gaza.
Hezbollah possesses a formidable arsenal of rockets and missiles that bloodied Israel during a monthlong war between them in 2006, but is constrained by its own domestic political goals and fears of Israeli retaliation.
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