Ukrainian President Petro Poroshenko and U.S. President Barack Obama lashed out Monday at Russia over conditions at the crash site of Malaysia Airlines Flight 17, saying Russian-backed rebels at the site continue to impede efforts to recover bodies and investigate exactly what happened.
Poroshenko, speaking to CNN's Christiane Amanpour, pleaded for international solidarity against the rebels fighting the government in Kiev. U.S. and other officials have said they believe rebels backed by Russia fired the missile that brought down the plane Thursday, killing all 298 aboard.
"I don't see any differences" between 9/11, the Lockerbie bombing and the attack on Flight 17, Poroshenko said, referring to the 2001 terror attacks on the United States and the bombing of a Pan Am flight over Scotland in 1988.
Such terrorism is a danger to the "whole world" and to "global security," he said.
Obama, speaking at nearly the same time in Washington, called on Russia to rein in the rebel fighters, who he said had treated remains poorly and removed evidence from the site.
"What exactly are they trying to hide?" he said.
Obama said it was time for Russia to exert what he called its "enormous influence" over the rebel fighters -- who U.S. and other officials have said are armed, trained and backed by Russia -- to persuade them to better cooperate with the international investigation.
"It's the least they can do," he said.
Despite the stern tone of the Ukrainian and U.S. leaders, the spokesman for a team of European monitors at the site said conditions have improved since a chilly reception immediately after Flight 17 fell from the sky.
"Today we have three Dutch forensics experts with us, and they're getting pretty much unfettered access," Michael Bociurkiw, the spokesman for monitors from the Organization for Security and Co-operation in Europe, told CNN's Chris Cuomo.
The rebels even provided some perimeter security to keep journalists at bay, creating a "dome of tranquility" for the OSCE monitors, Dutch forensic experts and a handful of Ukrainian aviation experts now at the scene, Bociurkiw said separately in a briefing for reporters hosted by the Ukrainian Crisis Media Center.
Handling the remains
The remains of 16 people were still missing Monday, four days after Flight 17 fell out of the sky, Poroshenko told Amanpour.
Earlier, the Ukrainian government issued a statement saying that 282 bodies and 87 "body fragments" had been recovered from the sprawling crash site.
A train carrying the remains of 251 of the passengers left the area Monday evening, video from the scene showed. Ukrainian officials said it would head to the eastern city of Kharkiv.
Obama and Poroshenko both deplored how the bodies had been treated before being loaded onto the train, echoing complaints that the remains had been left exposed to the elements for days and that rebels had stripped personal belongings from some of the bodies and their effects.
Poroshenko said the rebels' conduct was "barbaric." Obama called the handling of remains an "insult" and behavior that has "no place in the community of nations."
Dutch forensics experts who inspected the train Monday were "more or less" satisfied with how the bodies were being stored," Bociurkiw said.
Ukrainian government officials have said the bodies will eventually be taken to Amsterdam. Most of those who died in the crash were Dutch.
Bociurkiw did say it remains difficult to get to the site, and fighting between rebels and government forces in Donetsk could have a significant impact on the investigation, he said.
Ukrainian officials and rebel forces reported fighting around the train station in Donetsk on Monday, with city officials reporting damage to a residential building near the train station and a nearby market catching fire after it was shelled. The train station, however, remained in operation, the city officials said.
With air service out, an interruption in train service could hinder the ability of investigators to get into and out of the site, Bociurkiw said.
"That's very crucial, because it's the only remaining transport link between here and really the outside world."
Bociurkiw had no information about the status of a team of international crash experts staging in Kharkiv to inspect the debris.
Earlier, the Ukrainian government issued a news release saying the experts had reviewed photos of the crash scene.
Another team from the Netherlands remains in Kiev, according to the Dutch Foreign Ministry.
Dutch Prime Minister Mark Rutte met with relatives and friends of victims Monday, calling the session filled with sadness and "very touching."
"All of the Netherlands is feeling their fury. All of the Netherlands is sharing their deep sadness, and all of the Netherlands is just gathering around all the next of kin," he said.
'An outrage made in Moscow'
Meanwhile, intelligence analysts were working furiously to determine whether Russian officials
had any direct involvement in the downing of the jetliner -- an accusation Moscow has strongly denied.
U.S. analysts are examining phone intercepts, social media posts and information gathered on the ground to see what role, if any, Russian officials may have played, according to two U.S. officials directly familiar with the latest assessment who declined to be identified because of the sensitivity of the situation.
"We are trying to determine if they manned it, advised, or pulled the trigger," one of the officials told CNN.
U.S. Secretary of State John Kerry said there's no shortage of evidence that pro-Russian rebels shot down the jet.
There's video of a launcher with one surface-to-air missile missing, imagery showing the firing and intercepted calls with rebels claiming credit for the strike, Kerry said.
"We know from intercepts ... that those are in fact the voices of separatists," he told CNN's "State of the Union" on Sunday. "And now we have a video showing a launcher moving back through a particular area there out into Russia with at least one missing missile on it."
British Prime Minister David Cameron didn't mince words either on who was to blame. In an op-ed in The Sunday Times, he called the plane crash and its aftermath "an outrage made in Moscow."
Russian President Vladimir Putin fired back with a video statement posted on the Kremlin's official website early Monday, arguing that his country has been pushing for peace in Ukraine.
"We have repeatedly called on all parties to immediately stop the bloodshed and to sit down at the negotiating table. We can confidently say that if June 28 fighting in eastern Ukraine did not resume, this tragedy most likely would not have happened," he said. "However, no one should have the right to use this tragedy to achieve selfish political objectives. Such events should not divide but unite people."
He stressed that safety must be guaranteed for international experts investigating the crash.
"We must do everything to ensure their work has full and absolute security (and) ensure necessary humanitarian corridors are provided," Putin said.
On Monday, Russian officials floated the possibility that a Ukrainian fighter jet might have downed the plane.
Russian monitoring showed a Ukrainian Su-25 fighter jet flying along the same route and within 3 kilometers to 5 kilometers (1.9 miles to 3.1 miles) of Flight 17, Lt. Gen. Andrei Kartapolov of the Russian Army General Staff said at a news conference, Russian state media reported.
"We would like to know why the Ukrainian plane was flying along a civilian route on the same flight path as the Malaysian Boeing," Kartapolov said, according to the reports.
In his interview with Amanpour, Poroshenko rejected the Russian suggestion, saying all Ukrainian aircraft were on the ground at the time.
Pro-Russian rebels have also denied responsibility for the shootdown.
In an interview with Cuomo broadcast Monday on CNN's "New Day," the self-declared rebel Prime Minister in Donetsk, Alexander Borodai, said he believed Ukrainian forces either shot the plane down with a surface-to-air missile or, as the Russian general suggested, one of its own fighter jets.
"We didn't have motives and desire to do that, and it is obvious that Ukrainians have them," he said. "I can't say about desire, but motive is obvious that the crash of this plane was beneficial to them."
'Black boxes' found?
Borodai also told Cuomo that he believes rebels have retrieved the jet's "black boxes," but that he couldn't say for sure because he is not a technical expert.
Earlier, Borodai said the devices are under guard in the region. They will not be given to Ukrainian officials, he said.
Reuters distributed video Sunday of what appeared to be an inflight recorder found by a worker in a field. The agency labeled the video, shot Friday, as showing one of the two flight data recorders from Flight 17.
Some Malaysian investigators flew to the Ukrainian capital of Kiev on Saturday. But Malaysia's official news agency said they were still negotiating with rebels over access for their team.
Law enforcement officials from the Netherlands, the United States and Australia will help with the investigation led by the Ukrainian government.
Two FBI agents have arrived in Kiev, a senior U.S. law enforcement official said. An investigator from the National Transportation Safety Board was also there.