Temporary Detective Chief Superintendent Gordon Lang has praised the "excellent" police work by an off-duty officer who spotted double murder suspect James Allen in South Leeds.
Mr Lang added that the officer was in a car, observed Allen "for minutes" before calling in help.
More top news
Donald Trump has wasted no time making his mark on international matters as well as domestic. So how will his presidency affect the world?
Another cold, frosty and foggy night for many. Northern and western areas will see thickening cloud, patchy rain and milder temperatures.
Temperatures have already plunged to -12C in some parts of the UK this winter - but Thursday could be the coldest day yet.