Archaeologists now believe a dozen skeletons discovered in a mass grave in the centre of Oxford may have belonged to executed criminals from Saxon times.

A team of three archaeologists have been digging in the quadrangle of St John's College in Blackhall Road, off St Giles, for nearly two weeks since the discovery was made.

The bones of 12 or 13 bodies have gradually been uncovered after a body part was discovered 80cm below ground level by diggers excavating the plot before a new quadrangle is built.