In his speech on Wednesday, Nasrallah said Washington and Tel Aviv are laying the foundation for sectarian strife in a bid to ruin the social fabric in Lebanon.
The Hezbollah leader also rejected the US-backed Special Tribunal for Lebanon (STL) probing the assassination of former Lebanese Prime Minister Rafiq Hariri, saying its indictments lack credibility.
The former Lebanese premier and over 20 other people were killed on February 14, 2005 in massive explosions in downtown Beirut.
The STL, which was authorized by a US-sponsored Security Council resolution in 2007, was set up to look into the deadly incident.
The tribunal issued indictments and arrest warrants in June 2011 for four men identified by Lebanese officials as Hezbollah members.
Nasrallah said on Wednesday that the tribunal has refused to consider other scenarios such as Israel’s involvement in the murder.
He also accused media outlets and figures associated with the March 14th movement of jumping to conclusions, adding that they make accusations against Hezbollah without any basis.