51.   Investigators from the Istanbul fire services, quoted by the Anatolia news agency, ruled out the initial theory that the blaze was caused by a gas leak.

52.   It was not immediately clear what caused the blaze.

53.   After examining the train and questioning of survivors there is no evidence that the blaze was caused by an attack, he added.

54.   Fire officials are investigating if an electrical short-circuit caused the blaze.

55.   They said a joint investigation with the fire brigade had concluded that the blaze was caused by the ignition of rot mould.

56.   They said the blaze was caused by a gas leak which was followed by several explosions.

57.   Xinhua indicated Friday that according to a provisional inquiry an electric short circuit might have caused the blaze.

58.   It has not yet been established what caused the blaze.

59.   Meanwhile, the Naples gas company issued a statement denying earlier reports that the blaze was caused by a gas leak.

60.   Many reports have said that an electric short circuit caused the blaze.