Maintain a high standard of vigilance and ensure security is suitable and adequate. Limit the fuel that may be available, cylinders, flammable liquids and combustible materials that are easily ignited should be safely locked away. Matches and candles should be kept out of sight, preferably off-site.
Vandalism occurring in and around the place of worship should be considered within the risk assessment. Consideration needs to be given to automatic fire detection devices, such as smoke detectors, which can be linked to a remote central station if the risk is deemed to be high.
For further information on arson prevention read Safer Business: Information and advice to reduce deliberate fires.