Abdallah Azzam Brigades, an al-Qaida-affiliated group, released a video message with scenes from the Nov. 19 attack on the Iranian Embassy in Beirut, the Daily Star, a Lebanese newspaper, reported Thursday.
Sirajeddine Zureiqat warned Hezbollah in the video it may face further attacks in Lebanon in retaliation for its guerrilla operations in Syria in support of forces loyal to President Bashar Assad.
"The operations conducted against Hezbollah so far are just the beginning; worse attacks will come if they do not withdraw all their fighters from Syria," he was quoted as saying in the video. "Let them know they will regret everything they did."
Hezbollah strongholds in Beirut have been the target of what Lebanese security officials say are reprisal attacks.
Zureiqat said Hezbollah, a Shiite group with deep political influence in Beirut, is "creating al-Qaida in the hearts of the Sunni" community in Lebanon.
The official National News Agency in Lebanon reported Hezbollah Secretary-General Hassan Nasrallah is expected to deliver a speech on political and security issues Saturday.