WBZ-AM File

Boston police are investigating how possible evidence in a drug investigation disappeared from a home that was secured by officers while investigators waited for a search warrant.

Police say two robbery suspects were traced to a Dorchester house on September second where officers thought they saw marijuana and digital scales.

Police requested a search warrant, saying they also expected to find a gun.

But when the warrant arrived hours later, there was no marijuana, no scales and no gun. Police think someone removed the objects without police noticing.

A department spokeswoman tells The Boston Globe that officers are usually posted at the front and back of a home while awaiting a warrant. But in this case, two officers sat in a cruiser in front.

Commissioner Ed Davis has ordered an internal investigation.