A woman suffered serious head injuries when a firearm was discharged during an armed home robbery in Isabella Plains in August.

Police are seeking two men who allegedly forced their way into a townhouse about 9pm on August 22, one armed with a firearm and the other with a machete.

The men allegedly threatened several people inside the home and searched for money and valuables.

As they were leaving with stolen property, a firearm was discharged and a woman sustained serious head injuries. She was taken to hospital for treatment.

Both men were wearing dark hooded jumpers, pants and gloves.

Police are seeking witnesses and anyone with CCTV or dashcam footage from the Isabella Plains area on the night of August 22.

Anyone with information is urged to contact police via the Crime Stoppers ACT website.

News all day, every day at CityNewsQBN.com.au.