US stock indices closed mostly lower on Monday, to give up the strong gains made earlier in the session, due to mounting fears over the return of public lockdown.
The number of US coronavirus cases surpassed 3 million cases, and jumped to 12.5 million cases worldwide
California has already begun closing indoor operations at restaurants -except for home delivery-, movie theaters and bars in all counties due to the spike of coronavirus infections.
White House chief economic adviser Larry Kudlow said previously that reimposing coronavirus-restrictions is a "big mistake" for the economy.
To the oil market, West Texas Intermediate crude fell 1.1% to close at $40.10 a barrel, after it hit an intraday high of $40.7 and a low of $39.6.
Brent fell 1.2% to $42.72 a barrel, with a high of $43.3 and a low of $42.3.
As for stocks, Dow Jones rose less than 0.1% or 10 points to close at 26,086, with a day high of 26,639 and a low of 26,044.
Nasdaq fell 2.1% or 226 points to close at 10,391, after hitting a high of 10,824 and a low of 10,368.
S&P 500 fell 0.9% or 30 points to 3,155, with today's high at 3,235 and a low of 3,149.