 American Secretary of State Condoleezza Rice reaffirmed Washington's support for the Siniora government and added that Fatah al-Islam was trying to destabilise the democratically elected Lebanese government.But, Hezbollah leader Sheikh Hassan Nasrallah said he doubted the sudden rise in US sincerity in Lebanese internal affairs.Sporadic exchanges of gunfire were also reported between Lebanese troops and Fatah al-Islam fighters as the army continued to build up its presence around the Nahr al-Bared refugee camp.