Hello, I was the AI as @Garnascus has said.
When the Mercs first arrived, I reported them as intruders as they were not on the manifest and they were heavily armed and moving towards the bridge, then communications went down and I could not communicate with these intruders or the crew. Then I saw the CMO approach them, and to me without being able to hear it seemed like they had blocked the CMO off from fleeing towards the bridge or center of the station as they were flanked on either side of them. This is when I made my announcement that the intruders had made it to the bridge and were taking the CMO hostage - as this was my best knowledge at the time.
Once communications came up, the Mercenaries and Command both touched base with me to clarify they were from Central Command - cue the CC Announcement clarifying their role. I immediately informed Security it was a false alarm that was completely my fault while they were in the armoury still gearing up. Instead of stopping their gear-up, they continued and one officer accused me of being subverted.
Security continued to ignore Station Command's order to disarm, the Acting Captain's order to disarm, and the CC Announcement saying listen to the god damn Policy Enforcement (Merc) Team. Then, the Forensic Technician said something like "You should just rebel then." - due to the fact security was fully armed WITH tactical gear due to a lucky cargo find, refusing to comply with command's orders, and now one of them was encouraging sedition - I informed Command and the Mercenary team that Security was beginning to behave seditiously and that a mutiny could very well break out. Security was also talking about having a strike.
Lo and behold', Security got tired of debating with the Mercenary team, who had thus far only stunned a person that was encouraging rebellion (Security stuns people ALL the time and yet they were ready to go to war over this incident), and I wasn't aware of any incident with the diona except the fact the diona was actively harassing both me the AI, and the mercenary team.
Security's decision was to suddenly open fire on the mercenaries in the security lobby with no legitimate provocation, in an act of blatant mutiny. Noir stated their intent to seize Acting Captain Ora, and this sent me into mutiny mode. I locked down security, informed crew that they were committing a mutiny, and ordered all synthetics slaved to me to protect the Command Staff.
I have no information after this as I ended up wiping core to handle an extensive ahelp discussion regarding an AI's ability to harm people to defend command staff from mutiny.
In my opinion, Security engaged in hyper-valids this shift refusing the direction of numerous sources of corporate authority to stand the fuck down. It really annoyed me, and I wish I had just locked them in the armoury so they couldn't have interfered with the gimmick so much. But I don't know which of the security members were revs, loyalists or such - so that changes the dynamic a lot. I thought it was just MERC for the longest time.