Investigation into Malaysia Airlines Flight 17

A guard rides on a train carrying the remains of victims of Malaysia Airlines MH17 downed over rebel-held territory in eastern Ukraine as it arrives in the city of Kharkiv, under Kyiv's control, July 22, 2014.

Police officers secure a refrigerated train loaded with bodies of the passengers of Malaysian Airlines flight MH17 as it arrives at a Kharkiv factory for a stop, July 22, 2014.

An armed pro-Russian separatist stands guard as OSCE monitors and a team of Malaysian air crash investigators inspect the crash site of Malaysia Airlines Flight MH17, near Hrabove, Ukraine, July 22, 2014.

A Malaysian air crash investigator inspects the crash site of Malaysia Airlines Flight MH17, near the village of Hrabove, Ukraine, July 22, 2014.

Two KLM cabin crew reach out into a sea of flowers at Schiphol airport in Amsterdam, July 22, 2014.

Emergency workers carry a victim's body in a plastic bag at the crash site of Malaysia Airlines Flight 17 near the village of Hrabove, Donetsk region, eastern Ukraine, July 21, 2014.

Malaysian diplomats stand as Ukrainian President Petro Porosheko expresses his condolences outside the Malaysian Embassy in Kyiv, July 21, 2014.

A paramedic walks in charred debris at the crash site of Malaysia Airlines Flight 17 near the village of Hrabove, eastern Ukraine, July 20, 2014.

Toys and flowers are placed on the charred fuselage at the crash site of Malaysia Airlines Flight 17 near the village of Hrabove, eastern Ukraine, July 20, 2014.

A girl holding a candle squats next to candles forming MH17 during an event to mourn the victims of the crashed Malaysia Airlines Flight 17, in Kuala Lumpur, Malaysia, July 20, 2014.

Members of the Ukrainian Emergencies Ministry gather the remains of victims at the crash site of Malaysia Airlines Flight MH17 near the village of Hrabove, Donetsk region, eastern Ukraine, July 20, 2014.

Armed pro-Russian separatists stand guard at a crash site of Malaysia Airlines Flight MH17, near the village of Hrabove, Donetsk region, eastern Ukraine, July 20, 2014.

A resident stands near flowers and mementos placed at the crash site of Malaysia Airlines Flight MH17, near the settlement of Rozspyne in the Donetsk region, eastern Ukraine, July 19, 2014.