51.   Other cars carried additional hazardous chemicals.

52.   Participants at the Cartagena conference, which opens Wednesday and ends Friday, are to consider a plan by the U.N. environment agency to strengthen safeguards against hazardous chemicals.

53.   A CSX train derailed and spilled a hazardous chemical into a creek, forcing evacuations at a state park.

54.   A freight train burned and leaked hazardous chemicals in a tunnel near Camden Yards stadium on Thursday, a day after it derailed and virtually shut down the city.

55.   A CSX train derailed Sunday, spilling a hazardous chemical into a creek and forcing evacuations at a state park.

56.   Ammonia spilled from two large tanks near a village in Chechnya, and workers were trying Thursday to clean up the hazardous chemical.

57.   Another of the hazardous chemicals, sulfur hexafluoride, is often used as an insulator when space is at a premium.

58.   Attorney General John Ashcroft on Tuesday told Congress that terrorists may be planning an attack using a truck carrying hazardous chemicals.

59.   But Agriculture Undersecretary Joemarie Gerochi said last week the government has had trouble enforcing a ban on hazardous chemicals.

60.   But the group warned that the treaty will not work in developing countries that produce their own hazardous chemicals or lack effective regulations.