They will appear in court later this month.
Officials from a leading insurer say they are worried that there may be a big surge in crime following the coronavirus crisis.
Video footage of the flames have been circulating on social media.
Detectives want to hear from anyone who may have seen the woman last weekend.
Officers have spoken out following the arrests this week.
Officers are currently working to assess whether the weapons were being held legally.
Several tonnes of illegal tobacco, plus thousands of pounds in cash, were recovered in the raid.
The multi-agency operation saw success.
Police have issued a CCTV image of a man they want to speak to in connection with a theft incident.
Police are appealing for witnesses following the raid this week.
Extra funding has been secured to boost a team of specialists working to support victims of rape and sexual assault in Norfolk.