The San Diego Union-Tribune on Tuesday announced that it is laying off 178 of its 603 employees, with the bulk of the job losses affecting the newspaper’s printing and delivery operation.

The job reductions follow the closing of the sale last Thursday of the Union-Tribune to the parent company of the Los Angeles Times. The acquisition by the Tribune Publishing Co. will allow for the consolidation of the two newspapers’ printing operations, which will move from Mission Valley to Los Angeles where the Times is printed daily, along with national publications delivered to San Diego County subscribers.

In all, 100 operations employees, consisting mostly of truck drivers, machinists, electricians, packagers and pressroom workers, were among those laid off Tuesday. Other large staff reductions occurred in circulation where 29 employees were cut and in advertising sales and finance, which together saw their departments reduced by 36.

Within the newsroom, nine of the 173 staff members were let go, almost all of them working for U-T TV.

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