REFILE-US STOCKS-Indexes lower as materials, energy drag
(Corrects to say "drag" not "drags" in the headline)
* Crude oil falls after last week's gains
* Tyco soars after deal to merge with Johnson Controls
* Twitter falls as 4 top executives to leave co
* Indexes down: Dow 0.51 pct, S&P 0.53 pct, Nasdaq 0.42 pct
By Abhiram Nandakumar
Jan 25 (Reuters) - U.S. stock indexes were lower on Monday morning, led by materials and energy stocks, after last week's rally in oil prices fizzled out.
Crude prices resumed their slide, after a strong two-day run, as a record output from Iraq flooded a heavily oversupplied market.
U.S. stocks logged their first week of gains in the year last week, with the three indexes closing up 2 percent on Friday. Continuación...