41.   A surprise strike could trigger bubbles of hydrocarbons that might engulf the ship and cause an explosion.

42.   A separate investigation by the National Transportation Safety Board into whether mechanical failure caused the explosion will continue.

43.   Brian Jenkins, vice chairman of the international security firm Kroll Associates, cautioned against jumping to a quick conclusion that the explosion was caused by a terrorist bomb.

44.   Brian Jenkins, vice-chairman of the international security firm Kroll Associates, cautioned against jumping to a quick conclusion that the explosion was caused by a terrorist bomb.

45.   But even natural gas needs to be sent swooshing through long pipelines and leaks can cause devastating explosions.

46.   But he warned that a plane crash might cause an explosion of other stored nuclear material and disperse cancer-causing plutonium.

47.   Cable has caused an explosion of networks, with many targeting niche groups such as women, sports junkies, music-obsessed teenagers and minorities as subscribers.

48.   City leaders decided that the explosion was caused largely by poor economic prospects, and focused their efforts on creating jobs.

49.   Copeland was charged with three counts of murder and three counts of causing an explosion with the intention of endangering life.

50.   Demand from pension funds is causing an explosion in new offerings.