"Cover-up: Ukraine rebels destroying all links to MH17 air atrocity."-The Guardian.

"Pro-Russia separatist groups in eastern Ukraine are hastily covering up all links to the Buk missile battery suspected to have been used to shoot down the Malaysia Airlines passenger plane, according to western-based defence and intelligence specialists.
...
...concern that a cover-up was under way was fuelled by a standoff at part of the crash site between observers from the Organisation for Security and Co-operation in Europe (OSCE) and rebel gunmen, which ended with a warning shot being fired.

Postings on rebel websites immediately after the crash boasted of having shot down what they claimed was an Antonov Ukrainian military transport plane, but these have since been deleted.

...

 The rebels are suspected of having used a Russian-built, vehicle-mounted Buk missile system to bring down MH17, killing all 298 passengers and crew. 
...

The OSCE was trying to gain access to one part of the large crash site but the commander of a rebel unit, known as Commander Glum, blocked them. After the warning shot, the OSCE convoy departed.

There is also confusion over the black boxes and other devices apparently salvaged from the plane. A rebel military commander initially said he was considering what to do with them, while another rebel leader, Aleksandr Borodai, contradicting his colleague, said the rebels had no black boxes or any other devices.
...

Other material on rebel social media sites was being deleted, including pictures showing the alleged capture of Buk missile vehicles by rebels from a Ukrainian air base last month.

Rebels said the boast on the social media site on Thursday that a plane had been shot down was not put up by them but by a sympathiser who mistakenly assumed it was a Ukrainian military plane that had been shot down. But in a separate posting a rebel leader also claimed that a plane had been brought down. "We warned you – do not fly in our sky," he said. That too was removed."