Marine police officers dive to search for survivors near a capsized boat on the Chao Phraya river, in the ancient tourist city of Ayutthaya, Thailand September 19, 2016. REUTERS/Chaiwat Subprasom

FILE PHOTO - Polices officers watch a train pass in a subway station in Montreal, May 10, 2012. REUTERS/Olivier Jean

Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson

Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson

Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson

Protesters demonstrate against the Energy Transfer Partners' Dakota Access oil pipeline near the Standing Rock Sioux reservation, in Los Angeles, California, September 13, 2016. REUTERS/Lucy Nicholson

U.S. Federal Reserve Chair Janet Yellen removes her glasses as she holds a news conference following the Fed’s two-day Federal Open Market Committee (FOMC) policy meeting in Washington June 15, 2016. REUTERS/Kevin Lamarque

U.S. Federal Reserve Chair Janet L. Yellen speaks with attendees before she addresses the World Affairs Council of Philadelphia in Philadelphia, Pennsylvania, U.S., June 6, 2016. REUTERS/Charles Mostoller