A 67-year-old man was robbed of his wallet and personal items in a struggle outside Wanganui's Avenue Arcade.
The incident happened just before 9.30am on Friday when the victim was entering the arcade next to Barber Town from the rear car park.
He was approached from behind by the male offender and there was a struggle before his personal items were taken.
Whanganui Police are seeking help in catching the offender. After the robbery the offender ran from the carpark out on to Cameron Tce with the victim following.
He continued along Cameron Tce past the Work & Income building on the corner of Wicksteed St and Cameron Tce before heading north along Wicksteed St towards Guyton St.