Washington ? A coast-to-coast drug ring that offered scaled services – including phone-up home delivery of Mexican black tar heroin – was targeted Tuesday by federal agents who arrested more than 130 alleged drug traffickers.

Drug Enforcement Agents launched raids that started before dawn as they sought up to 150 people – about half of them illegal aliens, according to senior drug enforcement officials, who spoke on condition of anonymity.

The investigation by early afternoon had yielded 131 arrests in 151 cities from Charleston, S.C., to Los Angeles, based on 10 federal indictments and state charges, officials said.

The ring allegedly grew its own poppies and refined them in Mexico and smuggled an unusually pure variety of black tar heroin across the U.S.-Mexican border, mostly in Arizona, using couriers on foot or in vehicles.

The gang preyed on recovering heroin addicts. It sent street dealers out from 8 a.m. to 8 p.m. and operated outside methadone clinics where addicts receive treatment. The heroin was packaged in a quarter to half a gram sizes in balloons for convenience and drug dealers would offer addicts two free balloons – if they bought two balloons.

Other clients at first would get a number they could call and a courier would deliver the heroin in a car in a parking lot. Surveillance showed that after several sales, clients could call and order delivery of heroin to the front door of their home.

The raids Tuesday were conducted in cooperation with state and local police and designed to take down the ring’s entire U.S. distribution system all the way down to street-level dealers. No arrests were made in Mexico.

The investigation was conducted in Nashville, Memphis and Knoxville, Tenn.; Indianapolis; Columbus and Cincinnati, Ohio; Denver; Los Angeles and Riverside, Calif.; Charlotte, N.C.; Columbia, Greenville, Charleston and Florence, S. C.; and Phoenix.