A man is being questioned after allegedly mowing down a car thief in Melbourne's north on Thursday morning.

The Reservoir man woke to hear his Nissan Patrol and trailer being stolen from his Myrtle Grove property shortly after 5am.

Police block Regent Street in Reservoir. Credit:Radio 3AW

He jumped into another car and gave chase.

The thief driving the stolen Nissan stopped suddenly on Regent Street.