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7 September 2012, 11:57 | Updated: 7 September 2012, 12:06
Worried residents called the police last night after distant gunshots could be heard ringing out around Abbotts Langley and North Watford.
When officers contacted security at Leavesden Studios they confirmed the noise was coming from film rehearsals involving firearms.
Tom Cruise and Emily Blunt are currently filming 'All You Need Is Kill' there.
Two weeks ago Tom made a surprise visit to local curry house Veer Dhara in St Albans.