Oxford's Mara Yamauchi was forced to pull out of the Olympic marathon after less than 10 kilometres after suffering from a bruised ankle.
She tearfully stopped at the side of the road 9.4km into the race after deciding she could not go any further.
Britain's medal hope Paula Radcliffe was forced to withdraw with a foot injury earlier in the week. The race was won by Ethiopian's Tiki Gelana.
More top news
Council tree officers in Reading are trying to save an ancient mulberry tree in Caversham Court Gardens, which has collapsed.
I Am Team GB - events in Meridian West
Two schoolboys have been arrested on suspicion of arson after a blaze tore through the roof of a catholic church in Basingstoke.