After a FOI request some documents have been released, with large sections redacted; so the summary may suffice:
The documents suggest that U.S. special forces were deployed to Jamaica during the operation to arrest Coke, where they were “developing situational awareness and monitoring developments on the ground,” and regularly reporting back to Southern Command. The unredacted portions of the documents do not make reference to participation by U.S. special forces in the May 24, 2010 assault on Tivoli Gardens. So on my reading, these documents contain the first hard evidence that U.S. forces were deployed in Jamaica at the time of the assault, though it is not clear exactly what they were doing.

Several portions of the documents confirm the U.S.-directed P-3 surveillance flights. The documents note that the flights were observed by “open sources.” This likely refers to an image taken by a photographer for the Jamaica Gleaner newspaper.
Link:http://www.mattathiasschwartz.com/do...thern-command/