A police officer walks near the area where an explosive device left at a train station was detonated by the authorities in Elizabeth, New Jersey, U.S., September 19, 2016. REUTERS/Eduardo Munoz

Federal Bureau of Investigation (FBI) personnel search an address during an investigation into Ahmad Khan Rahami, who was wanted for questioning in an explosion in New York, which authorities believe is linked to the explosive devices found in New Jersey, in Elizabeth, U.S., September 19, 2016. REUTERS/Eduardo Munoz

Iraqi Prime Minister Haider al-Abadi speaks during his meeting with U.S. President Barack Obama in New York September 19, 2016. REUTERS/Kevin Lamarque

U.S. President Barack Obama meets with Iraq Prime Minister Haider al-Abadi in New York, U.S. September 19, 2016. REUTERS/Kevin Lamarque

U.S. President Barack Obama listens to remarks from Iraqi Prime Minister Haider al-Abadi during their meeting in New York September 19, 2016. Flanking Obama are Vice President Joe Biden and U.S. Ambassador to the UN Samantha Power. REUTERS/Kevin Lamarque

U.S. President Barack Obama meets with Iraqi Prime Minister Haider al-Abadi in New York September 19, 2016. REUTERS/Kevin Lamarque

U.S. President Barack Obama meets with Iraqi Prime Minister Haider al-Abadi in New York September 19, 2016. REUTERS/Kevin Lamarque

U.S. President Barack Obama meets with Iraqi Prime Minister Haider al-Abadi in New York September 19, 2016. REUTERS/Kevin Lamarque