Someone told him they knew where he parked his car. All very scary. Fortunately, those people knew him well and knew the circumstances behind the email. There were no repercussions. There's a lot of anger out there and nobody seems to know how to cope with it any more.
People are sickos.
We have bullet-proof glass all over the hospital, including surrounding our newborn nursery. The hospital I worked at last had metal detectors at the doors because loonies had come in and shot us up three times in one year. If I stay late at work, I have a doctor or a security guard or man of some sort walk me out. It's sad that people can't even feel safe where they work. Makes you wish you could pack heat, just in case.