Detectives have scaled up their response to a series of deliberate fires in the Glasgow area which may be linked to several blazes and gun incidents in Edinburgh.
Police Scotland said six properties in the west of Scotland have been targeted in a week.
A number of arrests have been made in the east of the country following a spate of violent incidents and officers have seized weapons, drugs and cash.
The force also confirmed it had visited more than 100 properties and was reviewing over 700 hours of CCTV footage.
Videos claiming to show the fires have been posted online alongside warnings naming families that have been linked to organised crime.
The Edinburgh attacks have been ongoing for a number of weeks but on 3 April a house was deliberately set on fire more than 50 miles away in Cortmalaw Gardens, in the Robroyston area of Glasgow.
The following day a garage on Milton Road, Kirkintilloch was torched.
