The Knox County Sheriff’s Office is investigating a head-on crash on Route 1 that injured four people.The crash was reported yesterday afternoon around 4:30.Authorities say Howard Taggart’s Chevy Blazer veered into the path of a Mazda, driven by 34-year old Jess Brann. Taggart had two passengers, 34-year old Allyson Taggart and 31-year old Holly Anderson. Howard Taggart was taken to Eastern Maine Medical Center where he is in critical condition. Brann was taken to Miles Memorial Hospital in Damariscotta, and Holly Anderson was taken to PenBay Medical Center in Rockport. Both drivers had to be cut out of their vehicles.