Suffolk County District Attorney Thomas Spota on Wednesday will announce the arrests of 24 people and the seizure of nearly 4 kilos of heroin and fentanyl in a 10-day sting.

Suffolk and Nassau county police departments worked in conjunction with the Long Island Drug Enforcement Administration Task Force, spurred by an increase in overdoses by drug users purchasing pure fentanyl and fentanyl laced with heroin.

Authorities said fentanyl is a synthetic opioid that can be up to 50 times stronger than heroin.

The noon news conference will be at the Suffolk County district attorney’s office in Hauppauge.

The seized drugs were wrapped in lottery ticket paper and found at drug overdose locations.

Exhibits will include 3.8 kilos of heroin and fentanyl, along with thousands of individually wrapped and stamped doses of drugs.

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Three handguns, an AK-47 assault rifle, a pistol grip shotgun, narcotics packaging materials, scales, grinders, a money counter, a bulletproof vest and about $20,000 will also be displayed, officials said.

The arrested defendants include residents of Deer Park, Mastic Beach, Massapequa, Brentwood, Ronkonkoma, West Babylon, Ozone Park, Middle Village and the Bronx.