An unidentified person was struck and killed by an L train in Manhattan this evening, according to the MTA. The incident happened at the 1st Avenue L stop shortly before 5:30 p.m., leading the MTA to suspend L service between 8th Avenue in Manhattan and Bedford Avenue in Brooklyn.

It's currently unclear if the death was the result of suicide, but one NYC Transit source said the motorman saw the person on the trackbed and applied the brakes, but there was not enough time to stop. The victim was pronounced dead on arrival.

Some commuters who were frustrated by the service disruption did not immediately know it was the result of a tragedy.

There were also service changes and delays in southbound F train service this evening, which the MTA attributed to signal problems at Delancey Street-Essex Street. As of 5:57 p.m., some southbound F trains were running over the C line from W 4 St-Washington Sq to Jay St-MetroTech. Other southbound F trains were running over the E line from Jackson Hts-Roosevelt Av to Court Sq, then along the G line to Bergen Street.

We'll update as more information becomes 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.