A top Hezbollah official, Mustafa Badr al-Din, the brother-in-law of the assassinated Imad Mughniyeh, was involved in the murder of the late Lebanese prime minister Rafik Hariri in 2005, Channel 1 reported last night.

Saudi King Abdullah, Syrian President Bashar Assad and Lebanese President Michel Suleiman are due to hold a crisis summit in Beirut today in a bid to maintain Lebanese stability if the international court investigating the matter issues indictments.

The assassinated prime minister was the father of Lebanon's current prime minister, Saad Hariri. Channel 1 reported that Mustafa Badr al-Din is the main suspect in Rafik Hariri's murder.

King Abdullah, who is seen as Saad Hariri's patron and is close to the Hariri family, arrived in Damascus yesterday and met with Assad, who has close ties with Hezbollah.

After meeting in the presidential palace, the two called on Lebanon to overcome the controversy to preserve the state's stability and integrity.

Assad's visit to Lebanon will be the first of its kind since the elder Hariri was murdered in a Damascus car bombing on February 14, 2005.