Israeli military officials said they had uncovered a cache in the city on Thursday night that contained explosives, military equipment and materials for manufacturing rockets.
Since the Cole was attacked by a small boat carrying explosives, military missions and embassies have been told to step up security.
In addition to the mountain of marijuana, they seized 89 assault rifles, a battlefield machine gun, grenades, plastic explosives, military uniforms and more than 80,000 rounds of ammunition.
Many questions remain about the seizure, which Yemen said also included small arms ammunition, ground-to-ground rockets, explosives, military-grade binoculars and more.
"Especially violent riots" took place near the southern Gazan city of Rafah, where three people were killed after trying to plant an explosive, the military added.
Explaining the number of deaths this weekend from improvised explosive devices, military officers in Iraq said the lethality and effectiveness of those weapons had intensified.
They haven't produced enough of either compound to test their blasting power, but calculations suggest they should deliver up to 30% more bang than HMX, the most explosive conventional military ammunition in regular use.
Hostages are said to have been forced to drive cars packed with explosives towards military targets.
They were armed and carrying a bomb with 88 pounds of explosives, the military said.
