Police say they believe that a man and woman who were gunned down in a Brewerytown apartment last week were killed during a drug robbery.

Investigators suspect that the alleged shooters stole marijuana from the apartment before they fled, Philadelphia Police Lt. Philip Riehl said Monday.

Three men have been charged in the deaths: Montez Bethea, 31, of the 1600 block of Conlyn Street; Darryl Rigney, 32, of the 6500 block of North 17th Street, and Rashann James, 32, of the 1900 block of North 30th Street.

The three were arrested on Friday and Saturday on charges of murder, robbery and related offenses.

Police have recovered three weapons, Riehl said.

Jemark Glenn Miller Daniel, 24, and Petranella London, also 24, of Brooklyn, were each shot multiples times and killed Dec. 8 in Daniel's apartment on the 3000 block of Redner Street.

London was a friend who had been visiting Daniel that week for his birthday, Riehl said. Police said they do not think that she was an intended target.

"We believe that she was just in the wrong place at the wrong time," Riehl said.

All three men have criminal records. James was charged with murder in a March 2007 shooting, court records show. A jury found James not guilty in November 2009.

James has also been charged with attempted murder, theft and assault, and he has been convicted of drug possession.

Bethea has been convicted of aggravated assault, carrying a gun in public and reckless endangerment, records show. Rigney has been convicted of drug charges and of carrying a gun without a license.

It was unclear Monday whether any of the three had retained attorneys.