DD is in the city centre waiting for her bus to work. Several fire engines sped by with sirens and lights on, and at that exact moment her phone rang. The caller ID said 'Emergency Call' and her exact location was displayed as an address on the screen. In her surprise she fumbled to answer it and accidentally ended the call. Her bus arrived, she got on it, and they didn't call back.
Neither of us have ever had a call like this - anyone have any idea what it could be? She definitely hadn't accidentally pocket dialled 999 and they were calling her back (my first thought) because the phone was in her hand and there's no 999 calls in her log.
The fire engines were likely a coincidence but it did seem odd that they went past precisely as her phone rang.
Any ideas?