U.S. West Coast port operations resumed in full on Monday after shipping companies suspended loading and unloading of freighters for the weekend, citing chronic cargo backups the shippers and dockworkers have blamed on each other during months of labor tensions.

Reopening of the ports to cargo vessels idled by the slowdowns and weekend suspension came as the shippers and dockworkers' union were scheduled to return to the bargaining table for further labor negotiations later in the day, the two sides said.

Shippers and terminal operators announced late last week they would halt cargo crane operations for container vessels at the ports on Saturday and Sunday because of mounting congestion that they said has brought the docks to virtual gridlock.