Law enforcement officers in Tucson and Pima County made 18 arrests Friday and Saturday night as part of a Southern Arizona DUI Task Force crackdown on impaired driving.

All 18 arrests were misdemeanors, according to Sgt. Douglas Hanna, Pima County Sheriff's Department Special Operations/DUI Unit.

Two drivers under 21 were arrested and three drivers were found to have extreme blood alcohol levels.

Over the two days 39 officers were deployed from 8 p.m. to 4 a.m. each day. In total, they made 91 traffic stops.

In addition to the DUI arrests, citations issued included:

• Four seat belt violations

• One child restraint violation

• 147 moving and non-moving violations

• Nine underage drinking violations

• 27 misdemeanor arrests

The Southern Arizona DUI Task Force is made up of officers from the Tucson, Marana, University of Arizona and Tucson Airport Authority police departments, the Pima County Sheriff’s Department, the National Park Service and the Arizona Department of Public Safety.

During the deployment there were no fatal collisions, Hanna reported. And five of the vehicles stopped by officers had designated drivers behind the wheels.