In a statement released on Saturday, Hezbollah said investigation shows that Badreddine's martyrdom was caused by artillery shelling by the militants near the Damascus International Airport.
“Investigations have showed that the explosion, which targeted one of our bases …, and which led to the martyrdom of … Badreddine, was the result of artillery bombardment carried out by Takfiri groups in the area,” the statement read, as reported by Press TV.
Badreddine's martyrdom will only boost Hezbollah's "will and intention to continue fighting these criminal gangs," the statement added.
It emphasized that the Lebanese resistance movement is engaged in a war against the United States and the Israeli regime, with terrorist groups active on the frontline.
Hezbollah fighters are combating alongside the Syrian army against a range of terrorist groups operating in the war-torn Arab country, including Daesh (ISIL) and the al-Qaeda-affiliated al-Nusra Front.
On Friday, Hezbollah announced Badreddine's martyrdom and held a military funeral for him in southern Beirut.
The 55-year-old Hezbollah commander led Hezbollah's military wing which is helping the Syrian government drive out foreign-backed Takfiri terrorists from Syria.
Badreddine also directed military operations against the Israeli invasion of Lebanon and was a frequent target of attempts by Tel Aviv, Washington and its allies to assassinate or capture him.
He was the cousin and brother-in-law of top Hezbollah commander Imad Mughniyeh, who was assassinated by Israel in 2008.