MH17: What are investigators looking for?

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GRABOVO, UKRAINE - JULY 21: Personnel from the Ukrainian Emergencies Ministry load the bodies of victims of Malaysia Airlines flight MH17 into a truck at the crash site on July 21, 2014 in Grabovo, Ukraine. Malaysia Airlines flight MH17 was travelling from Amsterdam to Kuala Lumpur when it crashed killing all 298 on board including 80 children. The aircraft was allegedly shot down by a missile and investigations continue over the perpetrators of the attack. (Photo by Brendan Hoffman/Getty Images) — JULY 21: Personnel from the Ukrainian Emergencies Ministry load the bodies of victims of Malaysia Airlines flight MH17 into a truck at the crash site on July 21, 2014 in Grabovo, Ukraine. Malaysia Airlines flight MH17 was travelling from Amsterdam to Kuala Lumpur when it crashed killing all 298 on board including 80 children. The aircraft was allegedly shot down by a missile and investigations continue over the perpetrators of the attack.

Today President Obama directly accused Russian-backed separatists of blocking access to the crash site.

Turning now to the crash of Malaysian Airlines Flight 17 in eastern Ukraine, which U.S. officials suspect was shot down by pro-Russian separatists.

Dutch forensic experts have gained access today to the remains of the victims and international investigators are on the ground, but have not been able to gain full access to the plane crash site.

As time wears on, concerns are mounting that some of the vital evidence has been tampered with or removed. This morning, President Obama directly accused Russian-backed separatists of blocking access to the crash site:

"They've repeatedly prevented international investigators from gaining full access to the wreckage. As investigators approached, they fired their weapons into the air,the separatists are removing evidence from the crash site, all of which begs the question, what exactly are they trying to hide?"

Retired chief pilot and former plane crash investigator John Ransom joins Take Two for more on what the investigators will be looking for. He is currently with Safety Operating Systems, an aviation consulting firm.