A man exposed himself to two young girls playing in Wellingborough.
The incident happened between 2.30pm and 3pm on Wednesday, February 18, in Queensway Park.
The offender, who is believed to be white and in his 30s, approached the girls, aged eight and 10, and then exposed himself to them, at which point they ran away.
The incident follows a similar one on Sunday in the town.
Officers are appealing for witnesses or anyone with any information to call Northamptonshire Police on 101.
Call Northamptonshire Police on 101 or Crimestoppers anonymously on 0800 555 111 or use the anonymous online form.