11.   Israeli authorities recently admitted the plane was carrying chemicals that can be used in the manufacture of the nerve gas sarin.

12.   Last year, Israeli authorities also admitted it was carrying a chemical used to make the nerve gas sarin.

13.   Last week, the Israel government acknowledged for the first time that the plane was carrying a chemical that can be used to produce the deadly gas sarin.

14.   Last year, Israeli authorities also admitted it was also carrying a chemical used to make the nerve gas sarin.

15.   Mr Lai said the government had completed a comprehensive review of how vehicles should carry toxic chemicals, but priority will now be given to cyanide.

16.   Mr Stokoe said the container was in good condition and the plastic bags carrying the chemical had not ruptured.

17.   Not only can pollutants be spread through the air, but dangerous chemicals could be carried by rivers and underground waters.

18.   One of the cars remaining underground still carried hazardous chemicals.

19.   Police evacuated the area and called in mountain rescue teams to help rescue injured from the wreckage amid fears of leaks from several rail cars carrying chemicals.

20.   Security in the city was increased Tuesday shortly before Attorney General John Ashcroft told Congress that terrorists may be planning an attack using a truck carrying hazardous chemicals.