An individual who met Hezbollah chief Hassan Nasrallah in person and shook his hand managed to "mark" him with a special substance, enabling Israel to track his movements over the following days, sources told Al-Hadath news channel. 

The marking, referred to by the sources as a "trace" placed on Nasrallah’s body, allowed Israel to monitor his location with pinpoint accuracy. Israeli forces waited for an opportune moment, ultimately tracking his movements back to his headquarters in the southern suburbs of Beirut.

The sources further revealed that Israel waited for two minutes after confirming Nasrallah’s presence at the site before launching the targeted strike.

According to the same sources, an informant for Israel had been monitoring Nasrallah's convoy, reporting its arrival at the location where the airstrike was carried out.