Army strengthens missile defenses as Hamas says will avenge operative's death; rioters throw rocks, explosive devices at soldiers on border; Egyptian delegation enters enclave

Terror group has promised 'consequences' for killing of operative; but a former top defense official believes group has too much to lose by escalating the situation

Gaza terror groups meet to discuss response to death of Hamas officer in northern Strip, as Israel apparently seeks to maintain calm

Hamas also claims that Israeli troops opened fire at one of the terror group's positions, causing no injuries

Highly rare exercise appears linked to botched IDF special forces raid in November, comes a day after Israel located 18th attack tunnel under Gaza border

Military says passage was discovered during construction of underground barrier around the enclave, five years after 2014 operation aimed at countering threat of tunnels

Military fills underground passage with cement, ensuring it can't be used, says it's deprived Lebanese terror group of central aspect of attack plans

Military says Lebanon terror group's cross-border tunnel has infrastructure for electricity, ventilation, communications; subterranean passage to be destroyed in coming days