Sydney bedroom intruder assaults girl, 8

Dominica Sanda

A search is underway for a hooded man who climbed through a young girl's bedroom window in the middle of the night and allegedly indecently assaulted her in Sydney's east, earlier this week.

The eight-year-old was asleep when the man climbed onto her bed and briefly spoke to her before allegedly indecently assaulting her at a home in Barker Street, Kingsford, in the early hours of Monday.

The girl, who was not physically injured, told her mother, who then contacted police.

The girl has told police the man had a British or Australian accent.

Police on Wednesday released CCTV footage of the man, believed to be in his 50s, who can be seen climbing into the ground floor window about 2.50am before climbing out and jumping the fence and fleeing the scene a few minutes later.

He was wearing a dark hooded jumper and cargo pants and was last seen running down Barker Street near the University of NSW towards McDonald's, Superintendent Karen McCarthy told reporters in Sydney on Wednesday.

The child and family are "extremely distressed" by the incident, Supt McCarthy said.

"This is a very rare but obviously a very serious matter," she said.

A large-scale police operation is underway to find the man.

"Police worked through the night and have gathered together a large amount of police resources to conduct a very thorough canvas of the area, including the streets that surround the location," Supt McCarthy said.

Anyone with CCTV or dash-cam footage of the area in the past two weeks is urged to hand it into police.