LAFAYETTE (CBS SF) – Police activity at the Lafayette BART station caused major delays for trains Wednesday morning, an agency dispatcher said.

BART trains were already delayed earlier in the morning by an obstruction on the tracks between the Walnut Creek and Lafayette stations.

READ MORE: Vegetation Fire Burning in San Jose Coyote Creek Area Near Capitol Expressway

There was some confusion among riders about the cause of the delays. One passenger called the KPIX newsroom to say that the delays were a precaution following a series of earthquakes in the Concord area this morning.

The obstruction has since been removed, the dispatcher said.

Just before 8 a.m. police cleared the Lafayette station at 3601 Deer Hill Road. But delays of about half an hour continued in the Pittsburg/Bay Point and San Francisco directions.

MORE NEWS: Willow Fire Breaks Out In Monterey County, Evacuations Ordered

© Copyright 2015 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.