The submarine was berthed at the Eastern Docks on a five-day officialvisit and had been just been visited by a school group shortly before the shooting.
Ms Irina Bokova, the Director-General of UNESCO, concluded her first officialvisit to the UK on Sunday following a three-day visit to London and Oxford.
Boundary discussions will feature more prominently than planned during the Chinese delegation's four-day visit to New Delhi and Mumbai, the official added.