Two men were arrested last night when a gang of six riding three motorbikes raided a watch shop at Brent Cross.
A police officer sustained a head injury as cops intervened and arrested two of the suspects at the shopping centre at 7.15pm.
A woman aged in her 50s was also injured on her arm, and one of the suspects was taken to hospital with minor injuries.
The second man was taken into custody at a north London police station.
Both men were arrested on suspicion of conspiracy to rob.
It is not yet known whether anything was stolen.
Cops are urgently trying to track down the four other suspects who made off on two bikes.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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