Strathclyde Police is invoking powers to stop and search people in Glasgow city centre to target gangs who carry knives and other offensive weapons.
Metal detectors are being used by police officers
Metal detectors can be used during searches, which have been made possible under the Criminal Justice and Public Order Act.
Police received intelligence that rival gangs were planning to clash in the city over the weekend.
Pedestrians and vehicles can be searched without a crime being committed.
Chief Inspector Colin Houston said the force would initially use the powers - under section 60 of the act - over the next 48 hours to combat violent crime.
He said: "Whilst crime has dropped 18% in the city centre in the past six months, we have had two fatalities.
"We can stop any pedestrian or vehicle and search them for offensive weapons.
"It's a power we will use sparingly and only when we have specific intelligence that there is going to be the potential for knife attacks."