Three Israeli Arabs from "Physicians for Human Rights" brought with them medical supplies.
Barak: Strike both unusual and serious; still unclear which militia in Lebanon is responsible for Tuesday's attack.
Groups urged Barak to leave coalition and bring down Olmert gov't; Barak says push has 'no place' in a democracy.
WHO had asked for medicine transfer; Palestinian official: Gaza to cut to partial power due to shortage.
Public Security Minister, PMO deny reports that negotiator Ofer Dekel met recently with jailed Fatah leader.