Police allege they seized a rifle from a property after investigating the source of a laser beam that had been shone on a police helicopter last night.
The chopper was conducting patrols over Beckenham about 11pm when it was "targeted by a green laser beam on numerous occasions", police said.
The helicopter flew towards the area of the laser and used the Forward Looking Infra-red Camera (FLIR) to pinpoint the origin of the beam to a house in Basinghall Street in East Victoria Park, a police spokeswoman said.
Police on the ground were directed to the area.
It is alleged police seized two green laser pointers, a rifle and several display knives from the property.
A 30-year-old man is assisting police with their inquiries.