CNN's article, "5 dead after powerful quake strikes in South Pacific", includes four named sources: Augustine Bilve (director at a hospital in Lata), Andrew Catford (program director for World Vision), humanitarian group World Vision, and the U.S. Geological Survey (USGS).
It also includes warnings from The Pacific Tsunami Warning Center, The New Zealand Ministry of Civil Defense and Emergency Management, Japanese authorities, and The New Caledonia High Commission that can be credited to public record.
The sources are fairly clustered together. The article moves from one source to the next without returning to a previous source once its section has finished.
A lot of the earlier statements about the tsunami come from people or named organizations, but the later information about various warnings comes from public record.
The reporter provides attribution using "said" clauses. The choice is invisible and effective.