Civilian or not, nothing goes into or out of the security zone without the permission of the Israeli army.
The former US President, Jimmy Carter, who held talks with the Syrian leader recently has said he believes "about 85%" of the differences between Israel and Syria have already been resolved, including borders, water rights, the establishment of a security zone and on the presence of international forces.
The last time I was here, we were embedded in the Green Zone security bubble of the African Union peacekeeping operation at the edge of the Somali capital, with its Ugandan and Burundian troops, its heavy mortars and armoured convoys.
But the BBC's Natalia Antelava, in Baghdad, says Wednesday's bombs - within the heavily fortified Green Zone - have cast serious doubts on the ability of the country's security forces to defend its citizens.
Cuban leaders said they will "act with the utmost restraint" and will take action to defend their territory only if the flotilla violates the security zone, an area anywhere from 12 to 20 miles outside of Cuba.
The East Side Gallery was created in 1990, when artists from around the world painted more than 100 works on the part of the inner wall that kept East Germans from crossing into the security zone.
Fitzsimons, Mr McGuigan and Mr Hoare had all been working for British security firm ArmorGroup, based in the Iraqi capital's fortified Green Zone, at the time of the shooting.
Mr Fitzsimons, Mr McGuigan and Mr Hoare had all been working for British security firm ArmorGroup, based in the Iraqi capital's fortified Green Zone, at the time of the shooting.
Information leaflets and letters were distributed to residents living in the 'core zone' to help them understand the simple measures they could take, such as tilting outdoor security lights downwards instead of up, that could make difference to how dark the night sky appears.
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