US STOCKS-Wall St rally loses steam as oil prices tumble
* Crude oil prices reverse course
* Apple, Intel rise after rating upgrades
* Aetna up on strong forecast, boosts insurers' stocks
* Dow down 0.11 pct, S&P down 0.1 pct, Nasdaq up 0.15 pct (Updates to early afternoon)
By Abhiram Nandakumar
Jan 12 (Reuters) - U.S. stocks were flat in afternoon trading on Tuesday, after an early rally was wiped out as crude oil prices once again held the markets hostage.
Crude prices were on a roller coaster ride. Earlier gains were erased as they retreated towards $30 per barrel, piling the pressure on already beleaguered energy companies and casting a pall on other sectors as well.
U.S. stocks have mirrored the movement of oil prices over the past two sessions: opening higher, only to reverse course later on sharp turns in oil prices.
Seven of the 10 major S&P sectors were lower, led by a 1.9 percent drop in the energy sector. Continuación...