1.   It put both the ammonia storage tank and the transmission line underground.

2.   They watch the planes in the sky and the anhydrous ammonia fertilizer tanks in the fields.

3.   An explosion rocked a farm chemical plant south of Sioux City on Tuesday, killing at least three people and rupturing huge ammonia tanks, officials said.

4.   Dave Huot, assistant fire chief in Salix, said two ammonia tanks capable of holding about a million gallons ruptured.

5.   One bomb destroyed part of a refinery and another narrowly missed a liquid ammonia tank in what Chechens called a near-catastrophe.

6.   Two ammonia tanks capable of holding about a million gallons ruptured, Huot said.

7.   An explosion tore through a fertilizer plant near here Tuesday, killing at least four people and rupturing huge ammonia tanks, officials said.

8.   An explosion tore through a fertilizer plant near here Tuesday, killing at least three people and rupturing huge ammonia tanks, officials said.