Hezbollah leader Hassan Nasrallah has been flown to Tehran for emergency medical treatment with severe cancer-related complications, the Lebanese radio station the Voice of Lebanon reported on Monday.
A different report from Lebanon claimed that Nasrallah was flown to Iran after he was wounded in an attack by Syrian rebels during a meeting he was attending.
The reports are attributed to "senior Hezbollah officials," but there were no official confirmation of the reports from any other source.
According to the reports, Nasrallah's deputy, Naim Kassem, has assumed command of the terrorist organization.
Last Friday, Syrian rebels threatened to attack Nasrallah if he continued to aid the regime of Syrian President Bashar al-Assad.
A message published on Thursday by the Joint Command of the Free Syrian Army said that Nasrallah was not immune from attack and that the rebels knew how to reach him. The message referred to Nasrallah as a "criminal" and said, "Your era has practically ended."
"Anyone who dares to attack our people and our land will pay a hefty price," the message said.
Citing opposition sources, Al-Arabiya reported that rebels have shelled Hezbollah positions in Syria and Lebanon in response to Hezbollah support for the Assad regime.