Elias Murr informs

"In 2006 the Lebanese defence minister, Elias Murr, told US diplomats that Mughniyeh was "very active in Beirut", hinting that he was involved in a spate of murders of Lebanese politicians who were hostile to Syria.
According to Murr, Mughniyeh was working with the IRGC on the one hand and the Syrian intelligence supremo (and President Assad's brother-in-law) Asef Shawkat on the other."