Health and safety officials have been checking gas appliances inside the flat to trace a leak, and the apartment block has been evacuated while tests continue.

BBC: Neil McFerran (l) and Aaron Davidson (r)

Developed by the company Traveler's Tales, the latest in the LEGO series, "LEGO The Lord of the Rings, " puts Frodo, Gandalf, Aragorn and the rest of the characters from "The Lord of the Rings" trilogy into block toy form as they trace storylines from the popular books and movies.

CNN: Lord of the Rings lines, as delivered by LEGO characters

Internet security firm Mandiant, which was hired by the Times to trace the attack, followed the hackers' movements for four months, to try to establish a pattern and block them.

BBC: New York Times 'hit by hackers from China'