OAKLAND — BART passengers were experiencing delays Sunday due to maintenance operations and police activity that hampered trips on sections of the Bay Area transit system.

In one occurrence, a 10-minute delay had occurred Sunday morning at the Coliseum station in Oakland in the direction of Daly City due to police activity. It wasn’t disclosed which law enforcement agency was involved. By 9:30 a.m., that delay had ended.

BART also reported Sunday morning that a 10-minute delay was underway on the San Francisco line in the direction of Berryessa in San Jose, Antioch, and Millbrae due to overnight track maintenance. By 10 a.m., that advisory had ended.

In recent months, BART passengers have suffered through mammoth delays and systemwide shutdowns that snarled the regional transit system.

In May, a fire near the San Leandro station disrupted service on the lines to the Berryessa (San Jose), Dublin and Lake Merritt (Oakland) stations.

In September, the entire BART system shut down due to a computer failure that halted service through the Transbay Tube for several hours.

In October, an equipment problem on the track in the Transbay Tube snarled trips through the underwater connection between Oakland and San Francisco for three hours during the morning commute.