A major election-integrity investigation has erupted in Alaska just days before the midterms, with federal authorities confirming that both civil and criminal investigations are now underway over allegations involving the state’s Senate race.U.S. Attorney Michael Heyman said recent information had been “deeply troubling” and confirmed that his office is working with the FBI, Alaska State Troopers and the Justice Department’s Civil Rights Division.Federal officials say the probe centers on allegations that political operatives helped recruit and prop up Daniel J. Sullivan as a “sham candidate” in an effort to influence the Senate contest.