VANCOUVER (CBC) - Police are looking for an injured woman who was the victim of an early morning assault in downtown Vancouver that was caught on surveillance tape.

Vancouver police received a report about a large pool of blood on the sidewalk in the 600 block of West Hastings Street shortly after 8 a.m. Thursday, spokeswoman Const. Jana McGuinness said.

Investigators reviewed two surveillance videos obtained from a business in the area and determined that a man attacked a woman around 2:40 a.m.

"A man and a woman were walking down the sidewalk when suddenly the man violently attacked the woman," McGuinness told CBC News Thursday night.

"He pushed her initially, and she went flying down backward to the ground.

"A few moments later, after walking away, he decided to come running back at her and from behind, hit her across the neck, causing her to fall on her face straight onto the sidewalk," McGuinness said.

The woman lay motionless on the ground for a period of time before wandering off, leaving a trail of blood behind her.

"The concern here for us is that this woman has not been located despite our efforts to find her at hospitals or other clinics. We cannot confirm her injuries or how she's doing," McGuinness said.

Police are asking the victim or anyone who may recognize her from the video footage to call 911.

The woman has long brown hair, and was wearing a dark coat and jeans. Her attacker was also wearing dark clothing and jeans.

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