The latest news says that the arrest was actually a sting operation by the Zimbabwean police.
Logo is a company registered in Jersey.
It seems that the 'mercenaries' were part of a coup attempt against Equatorial Guinea, recruited by a British man and were mostly South African members of the former 'Buffalo Battalion'. 16 men have also been arrested in Equatorial Guinea.
The whole episode was compared to a novel by Frederick Forsythe