Paramedics have treated people for injuries after an attack involving a possible noxious substance.
The incident happened in Bognor Regis, West Sussex, where police were called just after 4pm on Sunday.
Officers responded to a report of a disturbance on Sturges Road, near to the seaside town’s railway station.
It is believed a noxious substance may have been thrown during the course of the incident, police say.
Forensics officers in white suits were pictured at the scene, as the investigation continues.
A 32-year-old man was arrested on suspicion of aggravated burglary and remains in custody, a spokesperson for Sussex Police confirmed.
Keep up with all the latest news from the UK and around the world by following Sky News
Read more from Sky News:
Rescuers believe they have found body of Jay Slater
England players arrive home after Spain defeat
They said in their statement: “The ambulance service treated people for minor injuries, believed to be in connection with the suspected noxious substance.
“Officers are investigating, and there will be an increased police presence to provide reassurance.”