From the updated article: "The police were around the flat for about an hour and a half then a younger woman, mid 20s, ran out shouting 'she's in the kitchen' then about six to ten officers ran in. They carried out an older lady and she was taken into an ambulance."
As it happens, it turns out I'm Facebook friends with the mid 20s woman in question, she's posted a status alluding to the incident but has not outright explained it yet. I will keep the forum in the loop on any info she provides.