This is the terrifying moment a teenage girl pulls out a knife after fighting with a 15-year-old at a family park.
The two girls, aged 13 and 15, had allegedly "pre-arranged" a fight at People's Park in Grimsby after reports they fell out on social media.
Humberside Police are investigating the incident and have appealed for witnesses, report Grimsby Live.
Video believed to be filmed by one of the witnesses at the park shows the pair exchanging punches while grappling with each other.
One girl begins to strike the other in the head as witnesses seemingly jeer and mock them.
The pair then roll into a nearby hedge and continue to tussle with one another.
The girl on top, who is seen wearing black, then grabs the other's arm to stop herself from being hit in the head before the girl on the floor grabs the other's hair and hits her over the head repeatedly with her free arm.
Suddenly, the girl in black begins pulling the other's hair before the crowd exclaim: "She's got a f***ing knife mate, she's got a f***ing knife." referring to the girl in the skirt, who is believed to be a 13-year-old.
Those videoing the incident then move around to the opposite side of the two on the floor and begin shouting at the knife-wielding girl: "Put it down now."