Hartford — An Upper Valley man who overdosed last week in Hartford had ingested heroin from the same batch that has been found in a recent rash of overdoses in Brattleboro, Vt., police said on Thursday.

Brattleboro police have reported a dozen overdoses involving opioids and other substances since Tuesday, and said seven opiate overdoses occurred on the Fourth of July. The ones reported on Tuesday had some “similarities” between the “stamps” found on the heroin bags, according to a Brattleboro Police Department news release.

The stamp — Iron Man — was traced back to the man who suffered a non-fatal heroin overdose on June 26 in Hartford, Hartford Deputy Chief Brad Vail said on Thursday.

“Incidentally, many of our officers have just recently received Narcan training through the Vermont Department of Health in June and are now carrying it,” Vail said, noting that the man was revived by naloxone, the generic term for Narcan, administered by fire department personnel.

Two days earlier on June 24, the Lebanon Police Department reported a fatal overdose. Lebanon Police Chief Richard Mello said on Thursday the stamp found on the bag in that case didn’t match the majority of the ones seen in the Brattleboro cases.

Brattleboro police Capt. Mark Carignan issued the department’s first news release on Wednesday, saying that police and fire personnel, as well as the ambulance service Rescue Inc., responded to the July Fourth overdoses in a variety of locations around town, including a downtown alley, homes, hotel rooms and a gas station bathroom.

As of Thursday morning, none of the Brattleboro overdose victims had died, but two were in critical condition, Carignan told the Keene Sentinel.

“Seven is a shocking number,” he said of Tuesday’s overdoses.

Although there are similarities between some of the Brattleboro cases, not all involved the same batch of heroin, Brattleboro Detective Lt. Jeremy Evans said in a subsequent news release.

“While there were some commonalities observed in a few cases, preliminary investigation has not shown a distinct connection between all of the overdoses,” Evans wrote.

Brattleboro police issued its third news release on the topic on Thursday evening and said that nine of the overdoses are either suspected or confirmed to be related to opiates.

Two more are suspected to be related to Ecstasy and LSD, and police aren’t yet sure what the drug was that was used in one of the overdoses.

Material from the Keene Sentinelwas used in this report. Jordan Cuddemi can be reached at jcuddemi@vnews.com or 603-727-3248.