A POLICE helicopter and sniffer dog are leading the search as police investigate a stabbing in Darlington on Monday. 

Officers arrested a 15-year-old boy on Monday evening after a teenage was stabbed on Collingsway, near West Park. 

Video footage from the scene shows a roadblock in place on the A1 Southbound near Merrybent. 

A roadblock on the Northbound side of the carriageway was later also enforced, but both carriageways have now reopened. 

The Northern Echo: Picture: SARAH CALDECOTTPicture: SARAH CALDECOTT