Muammar Gaddafi's snipers are scattered across Tripoli, the Libyan capital.
Even areas that are under opposition control are not yet fully secure.
While Gaddafi's forces have withdrawn from most areas, sleeper cells have not.
Bab al Azaziyah - the site of Gaddafi's compound - is a front line still being held by the government.
And rebels knew that this would be their biggest challenge once they entered the capital.
Al Jazeera's Zeina Khodr reports from Tripoli.