POLICE are searching for a man who fatally stabbed another man at a house in Sydney’s southwest before fleeing the scene.

The assailant, believed to be aged in his 20s, was last seen running along Roberts Rd, Greenacre, towards Juno Pde.

The hunt began after a 22-year-old man was stabbed in the chest on Wangee Rd just before 2pm.

Police arrived soon after and found the man lying at the bottom of the front steps to his family home.

The officers performed CPR on the victim but he died at the scene.

Family members watched in disbelief as police descended on the house and scoured the surrounding area for witnesses.

A woman thought to be the dead man’s mother collapsed from shock about 3pm. Earlier, she had been seen being comforted by a man in his early 20s.

Nearby neighbours told The Daily Telegraph the family had lived at the house for less than a year.

“It is really sad,” said one woman, who did not want to be identified.

“It is really scary to think something like that could happen here.”

media_camera Family members console each other after the fatal stabbing on Wangee Rd, Greenacre.

media_camera Police put up a screen at a house where a man iwas stabbed to death. The street was still closed at 7pm as police and forensic units continued to analyse the scene. Neighbours said they heard “loud screaming” coming from the house before the incident. “There are always arguments coming from the home,” one neighbour said. Another said there was always loud music and loud banging noises at the home. Police would not say if the incident was domestic related. As the investigation continued, Wangee Rd residents were forced to wait outside in torrential rain as police closed the street within a 100m radius of the site of the stabbing. One police officer told residents police may be there all night. One man who lived close to the scene, said: “I just want to get home and feed my pets, then go to bed.” He had lived on the street for 30 years and said the “area has really changed since then”. “But we have never had any trouble before this ... it is a pretty quiet street,” he said.