Renewed concerns about a potential military strike against Syria sent the markets tumbling to a sharply lower close with the Dow plunging 122 points to 24,360. Nasdaq fell 33 points to 7106.

On the upside

Shares of Bellicum Pharmaceuticals (Nasdaq: BLCM) extended its gains.

FCB Financial Holdings (NYSE: FCB) is exploring a possible sale of the company.

ValuEngine upgraded BJ's Restaurants (Nasdaq: BJRI) from a Hold rating to a Buy rating.

On the downside

Nomura Instinet initiated coverage of Dropbox (Nasdaq: DBX) with a Reduce rating.

Cleveland Research downgraded Arista Network (NYSE: ANET) from a Buy rating to a Neutral rating.

Shares of Allegiant Travel (Nasdaq: ALGT) plunged ahead of a 60 Minutes report that will air this Sunday exposing the safety and maintenance records of the budget airline.

In the broad market, declining issues outpaced advancers by a margin of nearly 4 to 3 on the NYSE and by more than 5 to 3 on Nasdaq. The broader S&P 500 lost 7 points to 2,656. Bitcoin gained $46 to $7,878