A new search is being conducted Wednesday in connection with the killings of a mother and her two young children in Northfield. The search in the area of Interstate 93 between Exits 17 and 20 in Concord, Canterbury and Tilton is for physical evidence in connection with the investigation into the shooting deaths of Kassandra Sweeney, 25, and her two sons, Benjamin Sweeney, 4, and Mason Sweeney, 1.Their bodies were discovered one week ago at their home on Wethersfield Drive in Northfield. Investigators said each died of a single gunshot wound.>> GoFundMe launched for funeral expensesOfficials with the New Hampshire attorney general's office said the search is not the result of new information in the case. Drivers are asked to follow all road signage in the area and give investigators the "appropriate space to complete their work." A WMUR crew at the scene noticed that traffic was not being impacted by the search. New Hampshire State Police and New Hampshire Fish and Game K-9 units assisted in the search Wednesday. Another search was conducted over the weekend in the neighborhood near where the bodies were found. WMUR has also learned a state police helicopter has been involved in the ongoing evidence search. Patricia LaFrance, former county prosecutor in New Hampshire, tells News 9 there are a number of things investigators could be look for including a weapon, clothing or anything that might corroborate information they already have.In the wake of the killings, officials said there was no danger to the public, but they have not made an arrest in the case. They have only said that all parties involved have been accounted for.LaFrance also gave insight on why an arrest may have not been made."It could be a juvenile; it could be somebody that they are watching," LaFrance said. "So we don't know exactly, other than the fact that the attorney general's office felt that there was no danger to the public in general." Investigators have not commented on what, if anything, has been recovered from the search.Previous coverage of this case:Father, husband of Northfield shooting victims speaks out on social media Authorities searching for evidence in connection to Northfield triple homicide investigation Officials say they believe they know everyone involved in Northfield homicides Crisis help offered to first responders called to scene of Northfield deaths Woman, 2 sons found shot, killed in Northfield home, attorney general says