21.   The cell had four tons of ammonium nitrate, an explosive chemical, in Malaysia, the news release said.

22.   The fire was ignited by explosive chemicals being mixed by Yousef, authorities said.

23.   The House bill does not require the addition of tiny tracer materials, called taggants, to explosive chemicals, one of the provisions most fervently advocated by Clinton.

24.   The violations reported over the last two years include rusty, untested fire extinguishers and firehouses with faulty wiring, broken sprinkler systems and explosive chemicals stored near heaters.

25.   Workers include children and family members who mix explosive chemicals by hand without protection.

26.   A Libyan crossing into Egypt was detained on Wednesday for carrying explosive chemicals which he said were for use in his studies, Egyptian border officials here said.