Monitors from the Organization for Security and Co-operation in Europe (OSCE) and rebel fighters deliberate on a safe route to investigate the crash site of Malaysia Airlines Flight MH17 as nearby skirmishes between Ukrainian and rebel forces continue in Donetsk, Ukraine on July 30. Photo: Cui Meng/GT

Rebel fighters inspect OSCE vehicles en route to the crash site on July 30 in Donetsk, Ukraine. The team was forced to turn back due to the ongoing armed conflict between Ukrainian and rebel forces. Photo: Cui Meng/GT

Michael Bociurkiw, spokesman for the OSCE investigation team in Donetsk, Ukraine, walks past reporters on July 30. The OSCE has around 30 appointed investigators at the crash site. Photo: Cui Meng/GT

Reporters interview Michael Bociurkiw in Donetsk, Ukraine on July 30. Photo: Cui Meng/GT

Alexander Hug, chief OSCE team investigator in Donetsk, Ukraine on July 30 Photo: Cui Meng/GT

Alexander Hug discusses the route to crash site with rebel fighters outside their base in Donetsk, Ukraine on July 30. Photo: Cui Meng/GT

Reporters armed with video cameras wear bulletproof vests as the firefight draws near in Donetsk, Ukraine on July 30. Photo: Cui Meng/GT

Photo: Cui Meng/GT

A rebel fighter gestures for reporters to step back as the firefight nears in Donetsk, Ukraine on July 30. Photo: Cui Meng/GT

A well-equipped rebel fighter in Donetsk, Ukraine on July 30 Photo: Cui Meng/GT

A rebel sniper (left) in Donetsk, Ukraine on July 30 Photo: Cui Meng/GT

A rebel fighter stands guard in Donetsk, Ukraine on July 30. Photo: Cui Meng/GT