The NYPD has launched a manhunt for a male wearing a dark bubble jacket whom witnesses pointed to as the person who on Sunday pushed 61-year-old Wai Kuen Kwok to his death at a train station.

The incident happened at the Bronx's southbound D train station where the Chinese man was waiting for the coach.

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The subway train operator saw the victim, who was waiting on the platform with his wife on their way to have breakfast in Chinatown, but he could not stop the train fast enough that Wai was still in the air when the train hit him.

Three rail cars had rolled over the Chinese man before the train stopped. MTA, the rail operator, had to suspend the rail service from 145^th Street to Tremont Avenue on Sunday afternoon, a company spokesman said.

Wai and his pusher didn't know each other, the New York Daily News reports. The pusher immediately ran up the stairs and left the train station. Surveillance video showed that he rode the BX35, a local bus, after he left the station.

According to NYPD, the wife of Wai, who was heard screaming "Push, push!" when she witnessed what happened, was brought to Bronx Lebanon Hospital for trauma. Family members assisted the police in interviewing the woman who spoke only Cantonese.

Gary Kwok, the couple's 29-year-old son who lives with his parents at their flat in the Bronx and is a doctoral student at Adelphi University, described his deceased father as a "fine, regular family man." Wai used to work for a company that made kitchen supplies.

Probers believe it was an isolated incident - a random but purposely done attack by a stranger on his victim, the New York Times wrote.

Wai's death brings to 49 the number of people who were hit and killed by subway trains in 2014, according to the MTA spokesman. All were either accidental falls or suicides, but the Chinese man's killing was the first since late 2012 that a train passenger was deliberately pushed to his death by another traveler.

The pusher in the 2012 incident, Erika Menendez, was charged with murder for the death of the victim, an Indian immigrant. Police considered the incident a hate crime.

Tagssubway attack, train accidents, New York City