A Citizen user shows video of emergency personnel on the scene.

Reports indicate the trapped person is alive, but their condition is unclear.

Specialized units are responding to assist with the rescue.

Police are requesting that power be cut to the southbound C track to assist with the rescue.

Police confirm that a man is trapped under the train.

Firefighters are also responding to the scene.

EMS personnel are responding to assist.

Police have received a report of a person trapped under the fourth train car.

A 911 caller has reported an unconfirmed incident at W 116th St & Frederick Douglass Blvd.