National Grid union workers protest outside Boston police station

National Grid workers protested outside of Boston Police Headquarters in Roxbury on Friday.

Hundreds of gas workers marched to the station from North Station to raise awareness about natural gas safety and in the hopes of ending the lockout that has prevented them from working since June.

“There is no way that the Boston police, who protect the public, should have their area A-1 police station blown apart,” one protester said.

Last October, an explosion occurred that caused heavy damage to the station.

The lockout is the result of ongoing contract negotiations.