Two anti-tank missiles were fired at IDF soldiers near the Kissufim crossing, in the southern Gaza Strip, early Friday morning in the first incident of its kind since the cease-fire between Israel and Hamas took effect over five months ago.   While no one was wounded in the attack, the IDF reported that its soldiers were investigating suspicious movements along the Gaza border when they came under fire.   Since the onset of the truce agreement in June, Palestinians have fired over 20 rockets and 20 mortars at western Negev communities, yet this is first incidence of anti-tank missile fire. 10/31/08