11.   The cleanup operation continues around the clock.

12.   The cleanup operation here may be proving more costly and time-consuming than initially expected, Panamanian officials maintain, but that does not exempt Washington from its treaty obligations.

13.   The company yesterday took pains to praise some of those adversaries for their role in the cleanup operation.

14.   The environmental damage, and the degree to which it could be mitigated by a cleanup operation, is unclear.

15.   A cleanup operation is ongoing.

16.   A cleanup operation was under way Tuesday afternoon as police dogs combed the rubble in case others had been buried in the slide.

17.   A Mobil spokesman said cleanup operations were continuing, and had been expanded to Odiama village in Rivers state, where the company held talks Sunday with angry residents.

18.   A mercury spill was discovered in a heavily populated area in the Russian republic of Buryatia and a cleanup operation is underway, a news agency said Tuesday.

19.   A huge cleanup operation was underway Sunday, with workers loading oil-coated kelp into trucks and vacuuming up pools of sludge.

20.   After a series of cleanup operations staged late last year, the city notified vendors that their operations would be tolerated until the Idul Fitri celebration.