(Nov. 14) SAN FRANCISCO — After weeks of finger-pointing from both sides, a federal prosecutor has determined that the party at fault for slow moving shipments at West Coast ports is — well, both sides.

“The Pacific Maritime Association and the International Longshore and Warehouse Union concede that there has been a drop in productivity but dispute the causes,” wrote federal prosecutor Mark Quinlivan. “The United States believes there is credible evidence that both the Pacific Maritime Association and the International Longshore and Warehouse Union are at least partly responsible for this drop.”

U.S. District Judge William Alsup has the authority to sanction either side if it is determined that they are violating the federal work order issued Oct. 9.

Meanwhile, both sides returned to the bargaining table Nov. 13 after a weeklong break. Pension funds were expected to top the list of discussion points.