During our stay in Mindelo (September 2010) there was one attempted and one “successful” robbery from boats at anchor (this is OUTSIDE the marina).
On one boat there was 300 EUR missing and the other boat put up some resistance but got into a little bit of a fight. The perpetrator was a man who had swum out alone, which of course is not a common thing.
This was later said to be the first incident of this kind in a few years.
SY Nemo of Sweden