Police are investigating the death of a woman who was fatally struck by a train in a Brooklyn subway station this morning.

An NYPD spokesperson said an unnamed woman in her 30s or 40s was hit by an oncoming Manhattan-bound R train around 8:15 a.m. at the 4th Avenue and 59th Street N/R station in Sunset Park. She was pronounced dead at the scene, according to police.

The NYPD is investigating her death, but at this point, police believe she may have been on the trackbed in an attempt to retrieve a cell phone. An MTA spokesperson said that the agency was working with the NYPD to confirm details about the incident. [Update: Authorities are reportedly investigating the possibility this may have been a suicide.]

N and R service has resumed, but there are still delays along the D, N, and R lines.

UPDATE: A second person has today died after being struck by a train. According to authorities, the victim was killed just before 2 p.m. at the Beverly Road station in Flatbush. A spokesperson for the NYPD said that preliminary reports indicated the cause of death was suicide.

The MTA has suspended service on the 2 and 5 trains between President Street and Flatbush Av-Brooklyn College for the time being, and shuttle bus is currently available.

If someone you know exhibits warning signs of suicide: do not leave the person alone; remove any firearms, alcohol, drugs or sharp objects that could be used in a suicide attempt; and call the U.S. National Suicide Prevention Lifeline at 800-273-TALK (8255) or take the person to an emergency room or seek help from a medical or mental health professional.