Sen. Chris MurphyChristopher (Chris) Scott MurphyOvernight Cybersecurity: Senators want info on 'stingray' surveillance in DC | Bills to secure energy infrastructure advance | GOP lawmaker offers cyber deterrence bill Overnight Health Care: GOP pushes stiff work requirements for food stamps | Johnny Isakson opens up about family's tragic loss to opioids | Republicans refuse to back vulnerable Dem's opioids bill | Dems offer new public option plan Dems give muted praise to Pompeo-Kim meeting MORE (D-Conn.) condemned Russian separatists in Ukraine Saturday for their apparent meddling with the site where Malaysia Airlines Flight 17 went down.

"All you need to know about the character of Ukranian rebels is the disgraceful way they are handling crash site, bodies," Murphy tweeted.

The statement followed charges from Kiev that Russian-allied militias removed 38 bodies, plane fragments and other evidence from the site in Eastern Ukraine.

The rebels have limited international observers' access to the crash, and reporters combing the area have found piles of intact objects that were moved.

Large fragments of the plane were found in areas that are unsecured, and some bodies have been "lying in the humid weather" for three days, according to on-the-ground tweets from Paul Sonne, a Moscow correspondent for the Wall Street Journal.

Micheline Maynard, a former senior correspondent for the New York Times, said it was clear the site is not being managed in the standard way.

"All the plane crashes I've covered were immediately secured, evidence carefully categorized. #MH17 sounds like chaos," she tweeted Saturday.