Police have arrested and charged eight more people, aged 16 to 38, in an investigation into an ongoing gangland feud.
Since March there has been a series of assaults, shootings and firebombing incidents in Glasgow and Edinburgh.
A total of 20 people have now been arrested, and face charges including attempted murder, fire-raising, firearms offences and road traffic offences.
Police Scotland said the violence was linked to rival groups targeting each other and that the "horrendous offences" would not be tolerated.
On Wednesday, a 16-year-old boy and a man were arrested as part of the gangland probe.
Marshall O'Hara, 20, has since appeared in court charged with three attempted murders.
He is also accused of assaulting nine people on April 7 at three properties in Riddrie, Glasgow; Bishopbriggs, East Dunbartonshire; and Stepps, North Lanarkshire.
O'Hara made no plea at a private hearing in Glasgow Sheriff Court and was remanded in custody.
On Thursday, officers seized firearms during a search of two properties in South Queensferry.
Two men, aged 36 and 38, were arrested and charged in connection with firearms offences.
