The bodies were found this morning after police were informed of the matter.
Initial investigations have revealed that they have committed suicide after their parents objected to their love affair.
It is reported that the 18 year old boy does not attend school, while the 15 year old girl was studying at a school in the area.
Further investigations are conducted by the Kolonna Police.
Meanwhile, Police arrested the man who murdered his father-in-law in Ketalawala, Kegalle.
The 68 year old person was killed by his Son-in-Law with a club, when he tried to prevent a dispute between the suspect and his wife.The Police media spokesperson ASP Ruwan Gunasekara stated that the daughter of the deceased person who also received injuries, is currently receiving treatment at the hospital.