Jacob Russell

Human remains visible at the site of a mass execution of Yezidi civilians by Islamic State forces in Sinjar.

Falah Hassan Issa narrowly escaped massacres in Sinjar. He now works to help identify victims and support survivors.

The site of a mass grave in Sinjar.

Ali Khalal was captured by Islamic State militants and narrowly escaped execution. He now runs a documentation centre recording testimonies.

A Kurdish Peshmerga walks through the site of a mass grave in Sinjar.

Askar Ali Hama Amin lost her husband and son were buried in mass graves by Saddam Hussein's forces.

A man walks at a site where Islamic State militants massacred thousands of military cadets in Tikrit.

Caroline Barker of the International Committee for Missing Persons pictured in Tikrit.

Caroline Barker of the ICMP stands near human remains recently uncovered at a site in Tikrit.

Umm Hassan's son's remains were discovered in a mass grave in Tikrit.

An Iraqi militiaman gestures at human remains recently discovered at a site in Tikrit.

Human remains taken from a mass grave in Anbar province before processing in the Baghdad mortuary.

Mustafa Munjid leads a team identifying remains recovered from mass graves, pictured at the Baghdad mortuary.

A worker prays at the Baghdad mortuary in a room full of human remains recovered from mass graves.

Dhargam Kamil, forensic archeologist with the ICMP pictured at the site of a mass killing in Tikrit.

Human remains which were recovered from mass graves in a workshop in the Baghdad mortuary.

Fawaz Abdulabbas who works with the International Committee for Missing Persons, pictured at the site of an Islamic State massacre in Tikrit.

Visitors look at an exhibit showing a prehistoric skeleton in the Baghdad museum.

Umm and abu Hassan's son was killed and his body discovered in a mass grave in Tikrit.