They used disguises and flew in from different countries? The methods mentioned here are things I would expect any semi competent intelligence agency to use. IMO this article doesn't contain anything that suggests Mossad did it. If you look at motive I would agree that Mossad is a likely suspect. However motive is not evidence in any way.
15 police officers killed in Colombia helicopter crash (Reuters)
from the article: Hamas man's Dubai death was a Mossad-style execution