Delta Police Const. Ciaran Feenan says as many as 20 homes were cleared just before 3 p.m. Monday afternoon when officers were tipped about a suspicious package.
Feenan says the RCMP's bomb disposal team was called and a football-sized package was destroyed during a controlled explosion.
Investigators are certain the item was explosive, but they are still trying to determine who left the package, or why.
On Friday, a crude explosive device was found on the SkyTrain tracks between two Surrey stations, and was destroyed without causing any damage.
That incident has prompted increased security on the SkyTrain system, but no suspects have been identified in either the Surrey or Delta incidents. (CKNW)