People in areas affected by the Northeast and Midwest power blackout should expect delays in mail delivery and some deliveries may be missed.

Postal Service spokesman Mark Saunders said Friday the agency is experiencing particular problems moving the mail in the New York and Detroit metropolitan areas and mail may be slowed elsewhere also.

The Postal Service activated its command center Thursday night, he said, with staffers organizing alternate forms of transportation to move mail to and from the affected regions. The Washington-based center was continuing in operation Friday.

But delays are likely until power is restored, Saunders said.