Sarah Williamson, 23, the ex-girlfriend of Carlton skipper Marc Murphy, was visiting her father in Nairobi when they were caught up in the horrific siege that has seen 68 people killed and at least 200 wounded. Ms Williamson was also in Nairobi to study for upcoming law exams. Meanwhile, Sarah's sister, Amy, has cancelled media interviews this morning over concerns for hostages still in the mall. Amy took to Facebook as a media pack gathered outside her house. Terrified shoppers run to cover with police and security surrounding them. Due to certain safety and protection issues of those involved and those still in the building I have cancelled my interviews. I have been instructed to make no further comments on the matter, so for now let's all just hope this ends soon and those hostages are returned to there (sic) loved ones ASAP," she wrote. Australian lawyer Heidi Edwards was with a group who sheltered in a stairwell, having fled from a yoghurt shop when the shooting and explosions began. with Jessica Marszalek and Penelope Debelle, AAP