US stock markets grind lower as oil prices climb following report Iran seized a tanker

The mood in markets is darkening at the moment and I suspect it's oil that's the tail wagging the dog. WTI crude oil is now up $1.33 to $83.74 on the day and at a session high. It was as low as $81.50 earlier but has been bid up strongly in the past hour in a sign that Iran negotiations aren't going anywhere. There's a sense of disbelief that we're in a standoff right now and Iran is talking about…