The key that locks the door against terrorists also opens a wider gate to cross-border trade and travel.

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To enter the estate, guests must cross a salt marsh by wooden bridge, access an electronic gate and drive through a barn-turned-gatehouse.

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Larson's car appeared to hit where the cross-over gate a section that can be opened for people to travel back and forth from the infield to the grandstands is located in the fence.

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Syrians who opted to stay in the town on Sunday kept a low profile: one group of Syrian men said they would cross into Syria once Turkey reopened the border gate.

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