The Summit begins at McCormick Place in three weeks.
So far, many security have been vague. However, it is known that protective services personnel will guard federal buildings in the Loop during the Summit. More details on security measures will be released soon.
Last week, the Secret Service said Amtrak trains and Metra and South Shore commuter trains, would be allowed to proceed underneath McCormick place during the Summit, but they will be subjected to security-related stoppages and delays.
Chicago Police Supt. Garry McCarthy says the department has a good sense of where safety perimeters are going to be during the summit, but he confirms police have not been made aware of any so-called "protective red zones" that will be patrolled.
"They have a responsibility and authority to protect their buildings, and that's what we expect they are going to do. We've been working in committees with every department -- city government, federal government, state and local -- that's going to be involved in this," said McCarthy.
The NATO Summit is scheduled for May 20 and 21.