Police in Derry are searching for a boy who held a gun to a man's head after he was challenged for throwing litter on the ground.
At around 7.25 p.m. the man challenged two boys and two girls when they threw litter to the ground at Woodburn Park, Kilfennan.
It is understood the youths became verbally abusive and the man followed them to Kilfennan Park where one of the boys pulled a gun and held it to the man's head.
Police say the boys were 16 or 17 years old and are appealing to anyone with information.