A man steers his boat at Myitsone, outside Myitkyina, the capital city of Kachin state, in northern Myanmar December 18, 2014. REUTERS/Soe Zeya Tun

New York Mayor Bill de Blasio (C) and New York Governor Andrew Cuomo (L) tour the site of an explosion that occurred on Saturday night in the Chelsea neighborhood of New York, USA, September 18, 2016. REUTERS/Justin Lane/Pool

New York Mayor Bill de Blasio (L) and New York Governor Andrew Cuomo (R) tour the site of an explosion that occurred on Saturday night in the Chelsea neighborhood of New York, USA,September 18, 2016. REUTERS/Justin Lane/Pool

Federal Bureau of Investigation (FBI) officials stand amid the site of an explosion which took place on Saturday night in the Chelsea neighborhood of Manhattan, New York, U.S. September 18, 2016. REUTERS/Rashid Umar Abbasi

New York Mayor Bill de Blasio and New York Governor Andrew Cuomo survey the site of an explosion which occurred Saturday night in the Chelsea neighborhood of New York, U.S., September 18, 2016. REUTERS/Rashid Umar Abbasi

A vehicle is left damaged next to a garbage dumpster as a security official walks past the site of an explosion which took place on Saturday night in the Chelsea neighborhood of Manhattan, New York, U.S. September 18, 2016. REUTERS/Rashid Umar Abbasi

Federal Bureau of Investigation (FBI) officials label and collect evidence near the site of an explosion which took place on Saturday night in the Chelsea neighborhood of Manhattan, New York, U.S. September 18, 2016. REUTERS/Rashid Umar Abbasi

Federal Bureau of Investigation (FBI) and other security officials mark evidence near the site of an explosion which took place on Saturday night in the Chelsea neighborhood of Manhattan, New York, U.S. September 18, 2016. REUTERS/Rashid Umar Abbasi