ROCHESTER, N.H. (CBS) – Police in New Hampshire say they have a “strong suspect” identified and expect to make an arrest soon after a young woman was attacked in a gym parking lot.

Surveillance video captured the June 12 incident at Planet Fitness.

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Surveillance video shows man attacking woman outside Rochester, NH gym (Image from Rochester PD)

Eighteen-year-old Erin McCarthy was walking to her car around 10 p.m. when a man got out of his car, walked up behind her and punched McCarthy 39 times.

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McCarthy did not suffer major injuries, but was left bruised following the attack.

Erin McCarthy was attacked outside of a Planet Fitness in Rochester, NH (WBZ-TV)

On Friday, police say they have identified a “strong suspect,” and believe they will make an arrest in the upcoming days.

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“We are confident there will be a conclusion to this case in the near future,” Rochester Police said.