Armed robbers have struck at the Petrogas filling station in Bicester Road, Aylesbury.
Thames Valley Police is appealing for witnesses after two men, armed with a knife and possibly a firearm, attacked at between 7.45am and 7.55am on Monday morning (April 21).
A member of staff in his fifties was working in the petrol station at the time and was not injured.
The first offender was a black male, aged between 30 and 35 years old and well built. He was wearing a woolly hat with a black cap over the top, a red jacket with white stripes on the sleeves, black trousers with a white stripe down each side, white trousers and a pair of black builders gloves with blue fabric on the palms. He had diamond stud earrings in each ear and was carrying a black bin bag.
The second offender was a black male, aged about 30 years old, wearing a black cap, black top and denim jeans.
Anyone with information is asked to contact investigating officer detective sergeant Kerry Bradfield of CID at Aylesbury police station on 101 or to contact Crimestoppers on 0800 555111 or crimestoppers-uk.org.