A person struck and killed by a BART train Monday morning closed the El Cerrito del Norte and Richmond stations, causing delays in all directions, officials said.

Both stations were reopened by 10:15 a.m. BART passengers should expect residual delays of up to 20 minutes on the Richmond line in all directions, authorities said.

Around 7:30 a.m., a Warm Springs-bound train hit and killed a person who was on the tracks at the El Cerrito del Norte BART station, officials said. The victim’s identity has not been released.

The Richmond station had reopened for about an hour at 8:30 a.m., but officials closed the station again around 9:30 a.m. to allow authorities and officials from the Contra Costa County coroner’s office to conduct an investigation.

The temporary closure caused major delays on the Richmond line.

During the closure, trains that usually ran between Richmond and Warm Springs/South Fremont were turning around at the North Berkeley station, while trains on the Millbrae to Richmond line were only going as far as El Cerrito Plaza.

Officials encouraged passengers to use the El Cerrito Plaza station as an alternative. AC Transit offered bus service on the 72M and 72R lines to take passengers between the Richmond and El Cerrito Plaza stations.

Ashley McBride is a San Francisco Chronicle staff writer. Email: ashley.mcbride@sfchronicle.com Twitter: @ashleynmcb