ACT Fire and Rescue helicopters were called in to help put out the blaze which started on Sunday afternoon. By the evening, the fire was described as "under control".

"Firefighters have successfully contained a bushfire burning on the western side of Mt Ainslie," the Emergency Services Agency said.

"Crews from the ACT Rural Fire Service, ACT Fire & Rescue, and two water bombing helicopters worked together to gain control of the fire shortly before 5 PM Sunday.

"The fire burned an area of approximately 2 hectares."

Firefighters remained on scene into the evening to ensure the blaze didn't reignite.

The cause of the fire was still unknown. An investigation was underway.

There had been no reported damage to property and no reported injuries during the blaze.

ACT Fire and Rescue and several ACT Rural Fire Service departments attended the incident, which was reported at 2.45pm on Sunday.

Two helicopters were seen traveling back and forth from south of Lake Burley Griffin throughout the afternoon carrying water.

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The Rivers, Jerrabomberra and Gungahlin brigades were all engaged to assist in bringing the fire under control.

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