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Three masked raiders burst into a children's birthday party and threatened the group with knives in a terrifying burglary.
The men forced their way into a house in Old Catton, a village a couple of miles from Norwich, and threatened the adults and children at the party.
A mobile phone was stolen, but no one was injured.
Norfolk Police said the aggravated burglary suspects were linked to "county lines" drug dealing.
The Eastern Daily Press reported a couple were hosting their son's 10th birthday party on Friday night.
A man in the house, who did not wish to be named, told the paper: "We had just sung happy birthday and blown out the candles. They were all sat here eating on the sofa in a little row.
"This was a kid's party and they didn't care - they just carried on."
The three suspects reportedly demanded: "Where is the weed?" One of them was said to have run out of the property, saying they had got the wrong address.
All three men were described as black. Two were around 6ft tall with one slightly shorter. All were wearing dark clothes and balaclavas.
Insp Graham Dalton, of Norfolk Police, said on Saturday: "This must have been very distressing for those involved and I want to reassure the victims and other local residents that we are doing everything we can to find the offenders quickly.
"I do believe this is connected to Operation Gravity drug dealing and would ask anyone with information regarding those involved to contact the police immediately."
Anyone who witnessed the burglary, or who has information, is asked to call Norwich CID on 101 or Crimestoppers anonymously on 0800 555 111.