Wall Street market report
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(Close): US stocks closed lower on Tuesday, with analysts citing a number of reasons including US-led airstrikes against IS militants in Syria.
The Dow Jones fell 116.81 points to end at 17,055.87.
The S&P 500 slid 11.52 points to close at 1,982.77 and the tech-focused Nasdaq dipped 19.00 points to finish at 4,508.69.
Some stocks were hit by news that the US Treasury was cracking down on "tax inversion" deals.
Shares in AbbVie - which has agreed to take over UK firm Shire as part of a tax inversion, in which a US firm buys a foreign company so as to move its tax base to a more favourable locale - finished down nearly 2%.
After Apple denied rumours that it would be shuttering its recently purchased Beats music service, shares in the technology giant rose nearly 2%.