Two-year old Charlie Harris-Beard, who died of leukaemia in February, will be remembered at a ball to be held in May.
Charlied died after battling Acute Myeloid leukaemia in February 2013. All of the proceeds from the ball will go to Charlie's charity Cords4life.
More top news
A large tent has been put up around the area while investigations continue.
The kind gesture touched the hearts of many who shared and retweeted words of support for the officer on Twitter.
Two workers were forced into a back office as the robbers tried to force their way into a safe, police say.