Four people face charges of possessing drugs for the purpose of trafficking after a heroin bust in Kitchener.

Waterloo Regional Police say they arrested three men and one woman, all of whom reside in the city, on Tuesday.

At the time, heroin and marijuana were seized by police.

A search warrant was later executed at a home in the city, where more heroin was allegedly found.

Police estimate the street value of the seized drugs at more than $20,000.