Crooks snatched cash from a bingo hall on Friday (15).
The robbers struck the Mecca Bingo, in Burnt Oak Broadway, Edgware, at 2.10pm.
A witness said: "I think a man was emptying the fruit machines when he was robbed in the entrance hall.
"I think there was around £500-£1000 taken."
Officers were investigating the crime.
Bingo hall robbed
Crooks snatched cash from a bingo hall on Friday (15).
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