Cornish knife robberies 'linked'
Several armed robberies across Cornwall are believed to be linked, police have said.
In the past three weeks robberies or attempted robberies have taken place in Reawla, Cubert, Scorrier, Porthtowan and Lanner.
Police said the offender appeared to be targeting isolated premises and had taken cash from the tills after threatening staff with a knife.
Officers have released CCTV footage of a suspect following a raid on Monday.
The first robbery happened on 31 January when £100 was stolen from Reawla Stores, with hundreds of pounds being taken from a cashier at a petrol station in Scorrier on 8 February,
On the same day there was an attempted robbery at the Cubert post office and on 13 February a similar incident took place in Porthtowan Village Store where £300 was taken.
Police said the most recent attempted robbery was on Monday at Lanner Store.
Officers are advising people who work in isolated businesses to be vigilant.