Someone broke into a south Trinidad primary school, ransacked an administrative office and stuck a sanitary pad on a wall.
Police said on the unused pad were the words "P6Ps Gang." Investigators were trying to find out the significance of the words, saying as far as they are aware no such gang exists in the area.
The discovery was made at about 7 am on Thursday at the Princes Town Presbyterian No 2 Primary School in Craignish Village.
Police are also trying to find out what, if anything, had been stolen.
No one has been arrested.