1.   At the explosion site, the cloud of ammonia was almost crippling.

2.   For hours after the blast, angry residents formed a human barricade to keep journalists away from the explosion site.

3.   Gov. Terry E. Branstad toured the edge of the explosion site late Tuesday afternoon.

4.   His own home lies just one block from the explosion site.

5.   It was about three miles from the explosion site, on a line that was perpendicular to the damaged line.

6.   Ruth Brugette and several other residents who live near the explosion site have received settlement payments from Koch.

7.   Sen. Frank Lautenberg, who also toured the explosion site Monday, said that he anticipated problems in getting the pipeline safety bills passed by Congress this year.

8.   The experiments ranged from marching soldiers through nuclear explosion sites without informing them of the risks to injecting people with radioactive substances, again without their knowledge.

9.   The grand jury is meeting in the federal courthouse facing the explosion site, coming through an entrance still adorned with purple mourning ribbons and rough board windows.

10.   A small police truck near the explosion site was left mangled, its hood peeled back and shredded.