They were in on it.
I can't get a firm number of USCP officers under investigation for aiding and abetting these protestor tours, but it is at least 12 and maybe as many as 20.

Read the article I linked in Comment #44. Below is some material copied from that article that may answer your question.
There are several congressional investigations that will be undertaken or are underway, including a review by the House Administration Committee in consultation with House and Senate leadership; a joint investigation by the Senate Homeland Security and Rules and Administration committees; separate investigations by Appropriations panels in both chambers; a Government Accountability Office probe; and possibly a commission styled after the one that investigated the 9/11 attacks.
In addition, retired Army Lt. Gen. Russell Honore is leading a review of Capitol complex security, the Capitol Police Inspector General is investigating the riot and the department’s Office of Professional Responsibility is investigating at least 17 officers.