Police are appealing for witnesses and video footage after hundreds of teenagers stormed a birthday party in Welling.

Officers were called on July 26 at 8.38pm to a church hall on Deepdene Road, following reporters that over 200 people had turned up uninvited to a party.

Officers attended and dispersed crowds and stayed for some time to prevent a breach of the peace while attendees made their way home.

Reports indicated that individuals had turned up with weapons and a machete was recovered from the scene.

READ MORE: Three juveniles arrested and one 'found with machete' in Welling last night

Some officers were met by a hostile crowd and received minor injuries that did not require hospital treatment.

A section 60 stop and search order was implemented and a number of people were searched as part of this.

READ MORE: Riot police block off Welling High Street due to 'youth disorder'

Four teenagers were arrested:

A male and female, aged 17 were arrested for assault on an emergency worker.

A 17-year-old girl and 15-year-old boy were arrested for a racially aggravated public order offence. The 15-year-old male was also arrested for assaulting an emergency worker

All four remain in custody at a South London Police Station

Anyone who was at the party or nearby and is in possession of mobile phone footage should contact police on 0208 721 2025 quoting CAD 8528/26JUL.