In pictures: Gems stolen from car

1 of 10 The jewellery was in a briefcase in a car

2 of 10 The car, which was parked, was broken into on Monday

3 of 10 The owner was only away for "a couple of minutes"

4 of 10 The victim was travelling from his Oxfordshire home to an undisclosed location when the theft took place

5 of 10 Police say the snatch may have been pre-planned

6 of 10 But they are not ruling out an opportunist theft

7 of 10 Officers are studying CCTV footage

8 of 10 And are appealing for witnesses

9 of 10 The victim has not been identified by police

10 of 10 Police have not confirmed the exact value of the stolen items