51.   While not creating a nuclear explosion, they could release radioactive material over dozens of city blocks.

52.   While officials have said they intercepted communications that allegedly tied bin Laden or associates to the attacks, they have refused to release any materials, citing intelligence concerns.

53.   He added that any military attack on North Korean facilities ran the risk of releasing nuclear material that could endanger both the North and South.

54.   A fire was quickly extinguished and no toxic material was released in the blast, firefighter William Racowschi said.

55.   An explosion occurred late Tuesday at a nuclear fuel reprocessing plant northeast of Tokyo, possibly releasing radioactive material out of the facility, a plant official said.

56.   An explosion occurred late Tuesday at a nuclear fuel reprocessing plant northeast of Tokyo, possibly releasing radioactive material out of the facility, plant officials said.

57.   But he added he was certain that the radioactive material was released during one of the nuclear tests by France.

58.   But he added that he was certain that the radioactive material was released during one of the nuclear tests by France, Yomiuri said.

59.   These revelations came out Wednesday when the commission released archival material from the Energy Department about nuclear testing on humans during the Cold War.