MERRIMACK — Police are investigating three drug overdoses that took place over the weekend, claiming the life of one person.

Within 72-hours, three people overdosed in town. One person has died and two others are in critical condition.

“It is pretty significant for us to have three overdoses that are so severe in such a short timeframe,” said Deputy Police Chief Brian Levesque.

Levesque said there is no evidence to indicate that the three cases are connected. “There is nothing that really correlates things together … we haven’t found any similarities,” he said.

It is often difficult for authorities to prove where the drugs originate from, or the strain of the drugs, in this cases believed to be fentanyl, according to Levesque, who said it is important for the public to be made aware of the recent overdoses.

By announcing the overdoses, Levesque said he is hopeful that it will motivate at least one person to think twice before using, stressing an overdose is always a risk with fentanyl.

“The department is diligently investigating these incidences and into the sources of these drugs,” police said in a statement. “Investigators suspect the unpredictability of the drug fentanyl, but will be waiting on toxicology results.”

Authorities are asking the public for assistance, urging anyone with information about illegal drug activity in Merrimack to contact police at 424-2424. Anonymous tips are encouraged, said Levesque, adding tips may also be made from the department’s website.

It was one year ago when the town’s police chief pleaded for the creation of a drug investigation unit. Town officials approved funding to establish the special force, hiring a police sergeant and a patrolman for the newly formed special investigation unit that focuses solely on drug activity, including drug sales at hotels.