1. A cordon of police surrounded the building.

2. There they were met by a cordon of police, standing in front of a barrier of police tenders.

3. From Longman Dictionary of Contemporary English Cordon cor‧don 1 / ˈkɔːdn $ ˈkɔːrdn / noun [countable] PREVENT a line of police officers, soldiers, or vehicles that is put around an area to stop people going there Cordon of A Cordon of police surrounded the building