11.   Without a cleanup, the material would cling to surfaces and contaminate the area for decades.

12.   A spokeswoman with the Hong Kong Works Bureau was not immediately able to say how much the cleanup will cost or how much dioxin is contaminating the area.

13.   Natural gas platforms operated by foreign energy companies in the Gulf of Thailand have reportedly contaminated surrounding areas with mercury.

14.   Officials have not determined why the area was contaminated.

15.   Officials there said the danger was limited to radioactive dust escaping and contaminating the area around the plant.

16.   Romburger could not immediately say when the radiation leak occurred or how large an area was contaminated.

17.   The area is contaminated with heavy metals, petroleum compounds and chemicals, the report said.

18.   The disaster contaminated vast areas and sent a radioactive cloud over Europe.

19.   They suspect the deadly gas leaked out on some occasions, contaminating the area.