Three days after a police raid touched off a violent confrontation between the Lebanese Army and a militant Palestinian group, Fatah al Islam, the first clear look inside the camp on Tuesday presented stark reminders of Lebanon’s bloody past.

And ominous warnings from Palestinian groups in other camps as well as a suicide bombing in an apartment in Tripoli raised fears that the conflict could spread to other parts of the country and destabilize the already shaky government of Prime Minister Fouad Siniora.