28 April 2014 Last updated at 15:46
Police investigating the deaths of birds and prey in Ross-shire and the Black Isle have said another two dead red kites have been found.
This brings the total of dead raptors discovered since March to 22 - 16 red kites and six buzzards.
Tests have so far confirmed that 12 of the birds were poisoned.
A reward for information leading to a prosecution has been added to by donations from RSPB Scotland, landowners, farmers and the public.