PHILADELPHIA (CBS) – Philadelphia narcotics officers credit an extensive investigation for uncovering activity that precipitated a raid of two Northeast Philadelphia homes.

The raid, which occurred on McKinley and Elbridge Streets, led to the seizure of drugs and drug paraphernalia and four area men being arraigned on Wednesday and charged with possession with intent to distribute among other charges. (see related story)

36-year-old Frank Hidalgo is in jail with a bail of $10 million, 37-year-old Felix Fernandez and 26-year-old Ramon Pedraza are being held on $5 million each and bail for 48-year-old Henry Diaz has been set at $50,000.

All face multiple charges in connection with the confiscation of over $1.8 million dollars of heroin and $42,000 of cocaine, along with horse tranquilizer and other known cutting agents for drugs, grinders, scales, a loaded 22 caliber gun and more.

An additional hearing has been set for all four suspects to ensure any bail money presented for their release is not tied to the alleged illegal drug activity.

Their preliminary hearings are scheduled on October 30th.