A commercial plane carrying 295 people was allegedly shot down between the Ukranian and Russian border Thursday. The plane was flying at an altitude of 33,000 feet. While most outlets are reporting the plane being shot down, we currently have no official confirmation on what caused the crash or who was on the plane. President Obama is expected to address the press relatively soon.
The president of Ukraine has denied responsibility. According to NBCNews, Russian leader Vladimir Putin called the Malaysian Prime Minister to offer condolences. repeatedly calling the incident "a crash", never mentioning foul play. Officials from Ukraine have speculated that Russian separatists in possession of a buk launcher may have been responsible, but at this stage there is no confirmed evidence as to who is responsible.
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ETA: edited for clarity