With murders having reached a low point in Manhattan, the Manhattan district attorney’s office and the Police Department have begun an unusually close collaboration aimed at driving down other crimes, chief among them grand larceny, domestic violence and cybercrime.

The district attorney, Cyrus R. Vance Jr., and the police commissioner, William J. Bratton, have teamed up senior prosecutors and police commanders to devise strategies for targeting the main offenders believed to be driving crime in these arenas, using the same intelligence-gathering techniques Mr. Vance’s office has employed to dismantle street gangs. The latest example occurred Wednesday, when hundreds of police officers swept into the Grant and Manhattanville housing projects in Upper Manhattan and arrested scores of people suspected of belonging to three warring street gangs.

The ad hoc committees are meeting once a week, and they have been ordered to come up with strategies and concrete plans by July 1, Mr. Bratton and Mr. Vance said in a rare joint interview at the district attorney’s office.

As part of a template for relations between the two agencies, the district attorney’s office will provide the police with more than $20 million from drug forfeiture cases to pay for new technology. That money will go for security cameras, fiber-optic information systems and hand-held tablets that will feed police officers data about suspects, Mr. Bratton said.