A teenage thug wearing a Halloween mask pulled out a knife in front of two girls in East Park.

After revealing the knife, the youth then threatened to harm the girls’ families during the confrontation which happened just before 10pm on Monday. The two girls were left “shaken” but unhurt.

Humberside Police have now launched an investigation and it is yet another incident involving groups of youths at the popular park off Holderness Road.

A spokeswoman for the force said: “An investigation has been launched following reports a teenage boy approached a 16-year-old girl and her friend in East Park and made threats to harm her family.

To get the Hull Live headlines every day, simply pop your email address into the sign-up box just beneath the picture at the top of this article.

“The incident happened at shortly after 10pm on Monday as the girl and a friend walked past the skate park.

“The youth – who was around 17-18 years old, wore a black Halloween mask, dark trousers and a navy coat – is said to have shown the girls a small knife.

“He had a black bike and is said to have spoken with a London accent. Neither of the girls were harmed but were left shaken by the incident.

“When they walked away, it’s believed the boy returned to his friends, who were nearby, and they cycled off in the direction of McDonald's.

Watch: what antisocial behaviour is

“If you believe you know the identity of the youths, please call our non-emergency 101 line, quoting incident number 16/110876/20.”

East Park has been plagued crime and antisocial behaviour over the last few months.

In September a “racially aggravated” incident took place at the skate park. Read more.

The week before a man was arrested after a teenager was stabbed during a disturbance in the park.

The 17-year-old boy was attacked at around 7pm on Thursday, September 10. He sustained minor injuries to his shoulder and was taken to hospital for treatment. Read more.

Humberside Police confirmed a man, 19, was arrested on suspicion of wounding with intent.

Officers also investigated reports that two people were assaulted on Laburnum Avenue, east Hull, later the same evening.

It is said the pair had challenged a group of youths damaging vehicles parked on the street.

The latest crime statistics for your area

In August, residents described how the park had gone to "rack and ruin" with gangs of youths reportedly breaking play equipment, taking drugs and having sex in public.

In a bid to tackle the antisocial behaviour, Hull City Council has closed all of the side gates to the park from 7pm to 7.30am.

The park's 14 side gates were left open from the start of the coronavirus lockdown to allow access for daily exercise, with the main gate closed permanently.

Holderness ward councillors Linda Tock, Jackie Dad and Kalvin Neal wrote to Humberside Police Chief Constable Lee Freeman calling for action on antisocial behaviour.

Cllr Tock said youths had been lighting fires, swimming in the park's lake and riding around on bikes into the early hours of the morning.

She added problems began after restrictions on meeting in public were lifted in early June.

Humberside Police's Local Neighbourhood Team Inspector Lucy Kevan said meetings between residents, officers and Hull East MP Karl Turner had taken place to find ways of addressing the situation.