New York City police have a person in custody who is suspected to have lit a woman on fire in the subway and then watched from a bench as she became engulfed in flames and died.

Police arrested a man they said set a woman on fire while she appeared to be asleep on a New York City subway train on Sunday morning, killing her.

Police said an unknown male had approached the woman, set her on fire, and then left the subway car around 7:30 a.m.