Erekat: U.S. plan for Israeli-Palestinian peace irrelevant as long as settlement construction continues.
Fatah members have urged followers to use the 'doom's day weapon' employed during the second intifada.
UN probe indicates devices planted in 2006 war; IDF: Hezbollah trying to cover up truce violations.
Egypt announcement comes after Fatah unilaterally signed pact in Cairo on Thursday without reservations.
Lashing out at Israel is the tried-and-true way for the PA to gain sympathy in the Palestinian street.
IDF accuses Syria of providing Hezbollah with every type of military hardware in its arsenal.