Who is Hezbollah and why are militants involved in the Iran war?

People have long supported Hezbollah, seeing it as a line of defence against Israel (Picture: AP)

Three days after the US and Israel launched joint strikes on Iran, Hezbollah has now joined the fight.

The group launched a rocket and drone attack against a military base in Haifa, northern Israel, earlier today, spreading the conflict even further.

Hezbollah said the strike was in retaliation for the killing of Ayatollah Ali Khamenei, Iran’s supreme leader for nearly four decades.