The FBI investigated a former U.S. Capitol Police officer as a potential suspect in the Jan. 6 pipe bomb case, according to newly filed court documents in the prosecution of accused bomber Brian Cole Jr.

Defense attorneys for Cole said in a Wednesday filing that Shauni Kerkhoff, who was on duty at the Capitol during the Jan. 6, 2021, attack, was at one point treated by investigators as a “person of interest” and subjected to extensive scrutiny.