A further update from Thames Valley Police is below:
We are continuing to appeal for witnesses following a road traffic collision on the B4445 Chinnor Road, Thame at around 9.20am this morning.
Sadly a woman in her fifties and a man in his twenties both died. Two other adults were also seriously injured.
Collision involved a black Mini and White VW Golf.
We are appealing for witnesses and dash-cam footage. Please call 101 quoting reference 371 26/01/19.