Diners were enjoying their lunch just after 2pm on Saturday in Harris Park, western Sydney, when the man walked outside and fired the volley of bullets into the air before fleeing. The gunman remains on the run.

Police have now blocked off half of Wigram Street as inquiries into the shooting continue

"My wife and I were eating at Billu's Indian restaurant when this gunman appeared out of the middle of nowhere and fired away," said Ramkrishna Gudipudi, who was visiting the area for the day.

"After he fled we walked over and saw eight bullets scattered all over the ground."

Mr Gudipudi said he and his wife were unnerved by the shooting.

"You don't expect to be eating lunch and have bullets fired around you." 

Shots fired in Harris Park. Details unclear. pic.twitter.com/Mw6pY11ql1— Yadu Singh (@dryadusingh) April 18, 2015

Workers at the Sweet Land Bakery were also shocked to hear the bullets ring out in the usually quiet neighbourhood.

"We've all been asked to stay in the store while the police patrol outside."

NSW Police said that no one was injured during the incident and a crime scene has been established with specialist investigators now in attendance.

Police have urged anyone with information about the incident to come forward and contact Crime Stoppers on 1 800 333 000.