Northern Territory Police are investigating an incident of aggravated assault in Alice Springs earlier today.

Just before 9am a man allegedly struck a 36-year-old woman to the head with a sharp object while she was receiving treatment within the Alice Springs Hospital.

The offender fled the scene before police arrived.

The woman was treated for a laceration to the head.

Police believe the man and woman are known to each other and investigations into the circumstances surrounding this incident continue.

Police urge anyone who may have witnessed the assault or have information which may assist with their investigation to contact them on 131 444 or report it anonymously via Crime Stoppers on 1800 333 000 and reference PROMIS number 9189040.