Farrell appeared to clash with the Scotland players as the teams were leaving the field after their pre-match warm-ups

The RFU has been asked to explain Owen Farrell’s conduct in the Murrayfield tunnel after he was involved in a scuffle with Scotland players before England’s 25-13 defeat.

Six Nations officials have written to the RFU and SRU demanding an explanation for the fracas that broke out as both sets of players entered the tunnel after the pre-match warm-up.

Television footage of the incident is not clear but it appears to show a clash between England’s vice captain and Ryan Wilson, the Scotland No 8.

Farrell was said by one witness to have been “enraged” and England team-mates had to drag him away.

“Six Nations Rugby will be writing to the unions to request clarification on what happened in the tunnel,” a Six Nations spokesperson