A gang of youths dressed in combat gear fired ball-bearing guns at two young boys and a girl, hitting one in the head.

A bout six teenagers chased their terrified victims through a park after staging an ambush.

A 13-year-old boy from Crawley suffered a swollen ear after a ball-bearing hit him.

His 12-year-old sister ended up lost in Buchan Country Park, Broadfield, Crawley, after the three victims split up to escape.

The boy, his sister and a friend had been playing in the park.

Police want to speak to two girls aged 14 or 15 who were walking a black dog in the park at the time of the incident, at 12.50pm last Tuesday.