(131120) -- GIBRALTAR, Nov. 20, 2013 (Xinhua) -- Pedestrians queue at the border crossing between Gibraltar and Spain, Nov. 19, 2013. Spain implemented tighter controls at its border with Gibraltar on Tuesday. Spanish research vessel the Ramon Margalef entered the waters off Gibraltar on Monday. Britain's Foreign Office said that Spanish Ambassador Federico Trillo has been summoned to the Foreign Office, "in order to underline the British Government's serious concerns regarding an ongoing incursion into British Gibraltar Territorial Waters." (Xinhua/Xie Haining)
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