Authorities seized nearly 40,000 doses of heroin and fentanyl as well as 22 firearms as part of two separate probes in Trenton and Paterson.

Attorney General Gurbir Grewal said authorities have arrested 38 people, including the head and founder of a Bloods gang, as part of the long-term investigations. Grewal made the announcement Thursday during a news conference at a state police facility in Ewing.

Grewal says 22 guns, including five “assault rifles,” were seized in Trenton along with 11,000 doses of heroin and fentanyl.

In Paterson, 27,000 doses of heroin were confiscated. Officials also arrested Kashard Whitaker, a founding member of the 4K Boyz Bloods gang.

Grewal says the probe disrupted two opioid mills.

These are the latest in a series of large heroin busts in New Jersey this summer.

Authorities busted another large drug ring ran out of a Newark recreation center at the end of July. A heroin production facility in Irvington was busted in the beginning of July.