(S (S (PP-SBJ (NP (PP (BASENP (NNP 北海)) (IN の)) (BASENP (NN 石油) (NN 採掘) (NN 装置))) (IN は)) (COMMA 、) (VP (PP (NP (PP (BASENP (NN 警報)) (IN の)) (NN 後)) (IN で)) (VP (PP (BASENP (NN 空)) (IN に)) (VP (VP (VBO さ) (VP (VBV れ))) (VP (MD た)))))) (PERIOD 。))
北海 の 石油 採掘 装置 は 、 警報 の 後 で 空 に さ れ た 。
An oil rig in the North Sea has been evacuated after a security alert .