Chemical experts inspect the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY - RTST9C9

People gather at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani - RTST95L

The wreckage of a destroyed vehicle is pictured at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani - RTST948

Chemical experts inspect the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani - RTST9CB

People gather at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla south of Baghdad, Iraq, November 24, 2016. REUTERS/Alaa Al-Marjani - RTST62V

Destroyed vehicles are seen at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla south of Baghdad, Iraq, November 24, 2016. REUTERS/Alaa Al-Marjani - RTST617

Chemical experts inspect the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani - RTST980

Iraqi security forces inspect the site of a suicide truck bomb attack, at a petrol station in the city of Hilla south of Baghdad, Iraq, November 24, 2016. REUTERS/Alaa Al-Marjani - RTST62J

Destroyed vehicles are seen at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani - RTST95J

Firemen inspect the site of a suicide truck bomb attack, at a petrol station in the city of Hilla south of Baghdad, Iraq, November 24, 2016. REUTERS/Alaa Al-Marjani - RTST661

Iraqi security forces gather at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla south of Baghdad, Iraq, November 24, 2016. REUTERS/Alaa Al-Marjani - RTST60R

The wreckage of a destroyed vehicle is seen at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani - RTST94N

A destroyed building is seen at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani - RTST937

A man reacts at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla south of Baghdad, Iraq, November 24, 2016. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY - RTST5VI

People gather at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani - RTST93T

People gather at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani TEMPLATE OUT - RTST925

A man reacts at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla south of Baghdad, Iraq, November 24, 2016. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY - RTST60C

A youth inspects the site of a suicide truck bomb attack, at a petrol station in the city of Hilla, south of Baghdad, Iraq, November 25, 2016. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY - RTST90J

A man reacts at the site of a suicide truck bomb attack, at a petrol station in the city of Hilla south of Baghdad, Iraq, November 24, 2016. REUTERS/Alaa Al-Marjani - RTST619