▁from ▁the ▁police ▁in ▁ 2 0 0 3 . ▁Chinese ▁authorities ▁began ▁building ▁wire ▁f ences ▁" on ▁major ▁defe ction ▁routes ▁along ▁the ▁T umen ▁River " ▁in ▁ 2 0 0 3 . ▁Begin ning ▁in ▁September ▁ 2 0 0 6 , ▁China ▁ere cted ▁a ▁ ▁f ence ▁on ▁the ▁border ▁near ▁D and ong , ▁along ▁st ret ches ▁of ▁the ▁Y alu ▁River ▁delta ▁with ▁lower ▁banks ▁and ▁nar ro wer ▁width . ▁The ▁concrete ▁and ▁bar bed ▁wire ▁f ence ▁r anged ▁in ▁height ▁from ▁ ▁to ▁. ▁ ▁In ▁ 2 0 0 7 , ▁a ▁U . S . ▁official ▁stated ▁that ▁China ▁was ▁building ▁more ▁" f ences ▁and ▁install ations ▁at ▁key ▁border ▁out posts ". ▁In ▁the ▁same ▁year , ▁it ▁was ▁reported ▁that ▁North ▁Korea ▁had ▁started ▁building ▁a ▁f ence ▁along ▁a ▁ ▁stretch ▁of ▁its ▁side ▁of ▁the ▁Y alu ▁River , ▁and ▁had ▁also ▁built ▁a ▁road ▁to ▁guard ▁the ▁area . ▁ ▁In ▁ 2 0 1 1 , ▁it ▁was ▁reported ▁that ▁China ▁was ▁building ▁f ences ▁ ▁high ▁near ▁D and ong , ▁and ▁that ▁ ▁of ▁this ▁new ▁f encing ▁had ▁been ▁built . ▁ ▁It ▁was ▁also ▁reported ▁that ▁China ▁was ▁rein for cing ▁pat rol s , ▁and ▁that ▁new ▁pat rol ▁posts ▁were ▁being ▁built ▁on ▁higher ▁ground ▁to ▁give ▁wider ▁visibility ▁over ▁the ▁area . ▁According ▁to ▁a ▁resident ▁of ▁the ▁area : ▁" It ' s ▁the