The attack, the group’s first since 2013, announces its operational return to Nigeria.
Over the last month, the jihadist group has killed at least 174 Nigerien soldiers in three separate attacks.
The large video details several major Islamic State operations inside the Sahel over the last few years.
The official reportedly tweeted out the statement earlier today. The official website of the Hezbollah Brigades has so far not commented, however.
The rare joint statement both eulogizes Qassem Soleimani and Abu Mahdi al Muhandis and offers vague threats of retaliation in Bahrain.
This is the second time that several Iranian-backed militias in Bahrain have voiced their support of the Iraqi Hezbollah Brigades after U.S. airstrikes on the group.
Following a deadly rocket attack on a U.S. base in Iraq and subsequent U.S. airstrikes in response, the Iranian-backed Hezbollah Brigades threatens to further retaliate by continuing to target U.S. troops.
The Islamic State continues to make inroads in the Sahel, conducting several high-profile raids in the border region between Mali and Niger.