A thief snatched £100 from a till at an Aldi supermarket on Sunday.
The suspect, a white man, aged around 20 and wearing a black hat and black jumper, grabbed the cash as the 16-year-old shop assistant opened the till.
He ran off from the Marlborough Road, Romford, store at around 3.25pm on Sunday.
Contact Romford CID on 101 or Crimestoppers, anonymously, on 0800 555 111.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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