Police called to 'disturbance' on A1 near Edinburgh
The road has been closed at the Dolphingstone off slip as investigations continue.
Emergency services have responded to a "disturbance" on a main road east of Edinburgh.
Police were called to the A1 near Tranent around 1.35pm on Monday.
They remained at the scene throughout the afternoon and into the evening, closing a section of the road while officers conducted investigations.
A Police Scotland spokesman said: "Police in East Lothian were called to reports of a disturbance at the A1 near Tranent at 1.35pm on Monday.
"Enquiries are ongoing to establish the full nature of the incident and a number of officers, including those from operation support division, are in attendance."
The force would not comment on eyewitness reports of armed police being seen at the scene.
Traffic Scotland confirmed the A1 southbound has been closed at the off slip to Dolphingstone. Drivers are asked to take an alternative route.