Helicopter and police cars swarmed Radlett in the early hours of yesterday evening.
Eyewitnesses took to Twitter to report seeing around 20 police cars and a helicopter in the High Street at around 5.45pm.
The Borehamwood and Elstree Times is awaiting further details from Hertfordshire Police.
Did you see what hapepned? Contact the newsdesk on 07795 223 610.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here