US STOCKS-Wall St edges up, on track for 4th week of gains
* Trading volumes light ahead of Labor Day holiday
* Indexes on track for fourth straight week of gains
* Chicago PMI, consumer sentiment both top forecasts
* Indexes down: Dow 0.2 pct, S&P 0.1 pct, Nasdaq 0.1 pct (Updates to midday trading)
By Ryan Vlastelica
NEW YORK, Aug 29 (Reuters) - U.S. stocks rose in a quiet session on Friday, as the latest in a string of positive data pushed investors to extend a rally that had been briefly threatened by overseas concerns.
With the day's advance the S&P 500 is on track for its 12th rise of the past 16 sessions. It is also set to close out its fourth straight weekly advance and its sixth positive month of the past seven.
Wall Street fell early in the session after Britain introduced a note of caution into the market, raising its international terrorism threat level to the second highest level in response to possible attacks being planned in Syria and Iraq.
The Britain threat level "doesn't sound good, but unless there's definite news that's worse than things we've already seen recently, the market should be able to process it and move on," said Quincy Krosby, market strategist at Prudential Financial in Newark, New Jersey. "We've become conditioned to buy on dips. That's almost ingrained in the market." Continuación...