About 6 p.m., a man carrying about three packages was seen leaping from the platform onto the tracks at the MacArthur Park station. Witnesses said he jumped back to the platform without the packages, said Metro spokesman Paul Gonzales.
Service between the 7th Street/Metro Center station and the Wilshire/Vermont station was halted. A bus shuttle was set up to transport riders between the closed stations, Gonzales said. Other sections of both lines remained open.
Los Angeles sheriff's deputies have recovered at least one package from under the station's platform. A sheriff's department bomb squad arrived on scene to recover the remaining packages, Gonzales said.
The man who jumped onto the tracks was not taken into custody.
This story will be updated as more details become available.