NEWARK - Thousands of members of the Service Employees International Union marched in Newark Wednesday to call attention to their contract that is set to expire at the end of the year.

The demonstrators marched from Essex County Community College to Military Park. The demonstration blocked traffic for a while.

The members voted to authorize a strike for the 7,000 office cleaners and school janitors that make up the union if the demands of the contract aren't met.

SEIU Vice President Kevin Brown says the union members are looking for a raise to $15 an hour up from $13 and want health care benefits. The workers are set to strike Jan. 4 if an agreement is not met.

The workers clean buildings all over New Jersey, including NJPAC, Newark Penn Station and the Gateway Center.