( CNN ) -- An explosion ripped through a ball-bearing factory in southern New Hampshire on Monday , leaving at least 15 people hurt , a hospital spokesman said . Authorities dispatched at least eight ambulances and two medical helicopters to the New Hampshire Ball Bearings plant outside Peterborough after the Monday afternoon blast , Assistant Town Administrator Nicole MacStay said . Monadnock Community Hospital saw 15 patients after the explosion , spokesman Phil McFarland said . Thirteen of those were treated and released , while two were transferred to other hospitals , McFarland said . Company spokeswoman Kathy Gerrity told CNN none of the injuries appeared to be life-threatening `` as far as we know . '' About 450 people would have been working at the plant at the time of the 3:30 p.m. explosion , Gerrity said . The factory makes bearing assemblies for aircraft , medical and high-technology industries . New Hampshire Gov . Maggie Hassan said the state has offered to provide `` any assistance needed to local first responders . '' `` My thoughts and prayers go out to those injured in today 's explosion , to their families and loved ones , and to the entire Peterborough area where NH Ball Bearings is such an important member of the community , '' Hassan said in a written statement .
At least 15 hurt in factory blast , hospital says . The explosion happened Monday afternoon at a ball bearing plant in southern New Hampshire . None of the injuries appears to be life-threatening , a company spokeswoman says . The factory makes bearing assemblies for aircraft , medical equipment and high-tech industries .