((Not to retcon you Val, but I was writing this as you posted
-also note that this would be happening in T5, since Turn 4 has effectively ended, and its just time to crunch numbers and do sheets))
As the various delegates were chatting and gathering their things, a robed ComStar adept entered the room. He did not speak a word, and his face was obscured by the heavy cowl of his robe. His arms were crossed across his chest, and he stood very stiffly, but he did not speak. The cowl moved, indicating he looked at each of the remaining ComStar personnel in the room, who silently and swiftly left the room.
The man continued to wait, despite several of the gathered representatives giving him curious looks. When finally all eyes were upon him, he spoke. His voice was not loud, but it was strong, and carried an air of authority.
"Delegates of the Great Houses. I am afraid that I have some very serious news. It seems that here and on Outreach, there have been terrorist attacks against ComStar facilities. Precentor Outreach has even been killed in the blast there. I know this news must make you anxious, but for the moment, I must request that you all return to your respective hotels and stay on the premesis untill the situation can be investigated. Also, unfortunately, I must inform you that the Spaceports are not currently considered safe, and that there will be no dropships leaving the surface of Terra until we are positive those responsible are not plotting further attacks against you. Some of my Adepts will escort you to your accommodations. Thank you for your understanding."
As he spoke, a group of similarly robed men(albeit with their faces visible) entered the room. They were all big men, averaging nearly 6' tall, and easily weighed over 100 kg each. Military backgrounds were evident in the unconscious march the individual groups walked in(6 men for each delegation). One the escorts had moved near their principal, the robed man nodded to the room and then left. The robed acolytes did make any attempt to rush the assembled delegates out of the room, but they continually told the delegates that the palace was no longer considered safe, and that they would be much better off in their secured hotels, where entry and exit were more easily controlled.