"Hamas denounces the killing of some of the leaders of Hezbollah in the [Israeli] strike," Hamas spokesman Sami Abu Zuhri said in a statement.
He added that Israel was "messing" with the security of the region and trying to make up for the military "defeat" it sustained during its latest onslaught on the Gaza Strip.
Abu Zuhri noted that Israel launched the airstrike in southwestern Syria on Sunday only to achieve internal goals related to its snap election that will be held in March of this year.
Six members of the Shiite Lebanese movement Hezbollah were killed in southwestern Syria on Sunday when they were attacked with an Israeli military helicopter, Hezbollah said.
Israeli Defense Minister Moshe Ya'alon, however, refused to comment on the reports.