Police in New York have arrested a woman in connection with the death of a man pushed in front of a subway train.
Police did not release the woman's name, but said she "made a statement implicating herself".
Eyewitnesses said the victim was standing on a platform at the Queens subway station when a woman rose from a bench and shoved him onto the tracks as a train arrived at the station.
The death on Thursday was the second such killing this month.
A homeless man, Naeem Davis, has been charged with murder after allegedly pushing a passenger to his death in the Times Square subway station at the beginning of December.
The victim of the latest attack, 46-year-old Sunando Sen, originally came from India. He was a resident of Queens and ran a printing business on the Upper West Side.
He was pushed into the path of the train as he stood with his back to the alleged assailant, who fled the scene.
New York's mayor, Michael Bloomberg, said such attacks were rare.
"You can say it's only two out of the three or four million people who ride the subway every day, but two is two too many," he told a press conference.
New York police spokesman Paul Browne said in a statement that investigations into the incident were continuing.