A police operation in a suburban street has ended after masked, armed men were reportedly seen entering a house on the morning of October 3.

Members of the public were asked to steer clear of Wollongbar Avenue in Panania , a suburb in Sydney's south west, as the operation unfolded between 8am and 11.30am.

Police allege the raid was a targeted robbery, after a 24-year-old man was assaulted by the intruders and cash was stolen.

Superintendent Rodney Hart said the operation to secure the perimeter of the home lasted about three-and-a-half hours.

Police were told that a dark-coloured car was parked on the street before the alleged raid.

"Four males, all described as wearing dark clothing with their faces covered, and one possibly being armed with a firearm exited that vehicle and approa

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