Collocations for cordon - noun

tight
police, security

form, throw (BrE)
The security forces have formed a cordon around the apartment.
Police officers threw a cordon around his car to protect him.

break through
The crowd managed to break through the police cordon.

prevent sth
A police cordon prevented the marchers from entering the main square.

cordon around, cordon round (esp. BrE)
There is a tight security cordon around the area.