According to the article it's going into long term treasuries

In the bond market, Treasury yields continued to tumble. The yield on the 10-year Treasury fell to 4.84% from 4.90% late Wednesday. It had been at 4.95% on election night and above 5.30% last month. That could be a signal that investors are herding into U.S. Treasury bonds in search of something that’s safer to own as stock prices tumble.

For those who don't know how bonds work, a bonds yield going down means its price has gone up. Say a bond pays $2 a year. If that bond is priced at $100 then it's yield is 2% , if that bonds price goes up to $200 then it's yield is now only 1%.