If you were riding BART during rush hour Monday night, you might have heard about some delays at Embarcadero Station due to "police activity." People who follow BART's automated alert twitter feed know that those kind of delays happen a lot, and usually there isn't much more to the story. But Monday's delay was different, as it resulted in a woman's arrest after an alleged battery of a small child.

BART first announced a service advisory at 6:22 p.m. Monday. saying folks traveling in the San Francisco International Airport, Millbrae and East Bay directions through Embarcadero Station should expect delays. According to Bay City News (via KTVU), however, the trouble actually began at 6:10 Monday night, when a rider reported that a female passenger on an inbound train was battering a small child.

Both the victim and a witness got off the train at Embarcadero, where they reported the battery to BART police dispatch, BART police Lieutenant Michael Hayes says. However, both the witness and the victim left Embarcadero station before police arrived, so details of the incident remain sketchy, officials said today.

Despite the absence of the witness or victim, BART police continued to seek the suspect based on the description the victim and witness provided before they took off, Hayes says. And their search apparently bore fruit, as BART police found their suspect at the Civic Center station, a woman with two outstanding arrest warrants.

Officials did not provide the suspect's name or additional information at publication time, but could confirm that the woman was booked into San Francisco County Jail on the basis of the two warrants, which were worth a total of $60,000.