York Regional Police say they have discovered a massive ecstasy drug lab inside a Unionville home.

Officers found about 25 kilograms of drugs inside the home on Bibury Gate, near Warden Avenue and Steeles. Drug-making equipment was also seized.

The haul is worth millions of dollars, police said.

Officers executed a search warrant on the residence over the noon hour. Hazardous materials teams were also called in.

Six people have been arrested. Police say at least one more suspect is being sought.