HRABOVE, Ukraine (AP) -- The chaotic Malaysia Airlines Flight 17 recovery effort stumbled again Monday, with more bodies found at the sprawling crash site but a worrisome power outage in the refrigerated train holding over 200 of the dead.
The shambolic attempts to investigate by the pro-Russia separatists who control the verdant farmland where pieces of the plane crashed to Earth have fanned widespread international outrage, especially from the nations whose citizens were on the doomed plane. Four days after the jetliner was shot out of the sky, international investigators still had only limited access to the crash site in eastern Ukraine.
Emergency workers piled 21 more black body bags from the blackened crash site by the side of the road Monday in Hrabove. That brought the total found to 272 of the 298 passengers and crew killed in the tragedy, according Prime Minister Arseniy Yatsenyuk.
The bodies were being sent to the refrigerated railcars in the nearby town of Torez, where the other bodies are being kept. But a train engineer told The Associated Press that the cars' refrigeration had been off overnight and it was not immediately clear why. The cooling system was back up and running early Monday, he said.
The smell of decomposing bodies was much more pronounced Monday at the Torez train station than a day earlier, when 196 bodies were put into the train cars. Four rebels armed with automatic weapons were standing guard around the cars.
Ukrainian officials say the plane was shot down by a mobile missile battery from a rebel-controlled area in eastern Ukraine. They said the BUK rocket launcher was supplied from Russia and operated by Russian personnel.
The United States presented what it called "powerful" evidence Sunday that the rebels shot down the Boeing 777 with a Russian surface-to-air missile. That evidence included video of a rocket launcher, one surface-to-air missile missing, leaving the likely launch site; imagery showing the firing; phone calls claiming credit for the strike and phone recordings said to reveal a cover-up at the crash site.
"A buildup of extraordinary circumstantial evidence ... it's powerful here," said U.S. Secretary of State John Kerry.
"Russia is supporting these separatists. Russia is arming these separatists. Russia is training these separatists," he added.
Fighting flared again Monday between the separatists and government troops in the eastern rebel-held city of Donetsk. City authorities said battles were taking place near the town's airport and warned residents to stay inside. An AP reporter heard several explosions and saw smoke rising from the direction of the airport.
Pressure has been growing on Russian President Vladimir Putin, who the U.S. and others say has backed and armed the rebels, to rein in the insurgents in Ukraine and allow a full-scale investigation. Russia has denied backing the separatists.
Putin lashed out against those criticisms again Monday, accusing others of exploiting the downing of the plane for "mercenary objectives."
Putin said Russia was doing everything possible to allow a team of experts from the International Civil Aviation Organization, a U.N. agency, to investigate the scene. He again criticized the Ukraine government authorities in Kiev for reigniting the fighting with the pro-Russia rebels who control the crash site.
"We can say with confidence that if fighting in eastern Ukraine had not been renewed on June 28, this tragedy would not have happened," Putin said. "Nobody should or does have a right to use this tragedy for such mercenary objectives."
Yatsenyuk, Ukraine's prime minister, angrily called on Russia to halt what he said was its support for the rebels.
"They have to stop, and President Putin has to realize, enough is enough," he said. "What we expect from Russia: To de-escalate the situation, to withdraw their agents, to close the border, to stop their support for these bastards, and to stick to international law and international observations."
A team of international monitors, including three from the Dutch National Forensic Investigations Team, were to visit both Torez and the crash site later Monday.
Dutch Prime Minister Mark Rutte, whose country lost 192 citizens on the plane, told a news conference that repatriating the bodies was his "No. 1 priority."
Rebel leader Alexander Borodai denied his fighters were trying to tamper with evidence at the site, saying the bodies would be turned over to a team of Malaysian experts. A group of investigators that included Malaysian officials was in Kiev, but said they wouldn't go into rebel-held areas until they get better assurances about security.
Despite Borodai's claims, it was clear that the rebels were interfering in the investigation.
Lyubov Kudryavets, a worker at the Torez morgue, said the evening the plane went down, a resident brought in the bloodied body of a young child. On Saturday, militiamen came to take away the body away, she said.
"They began to question me: 'Where are the fragments of rocket? Where are the fragments from the plane?"' Kudryavets said. "But I didn't have any wreckage. ... I swear."
Experts said even if investigators were granted access now to the site, it might be too late.
"Even without any deliberate attempt at a cover-up, the crash site is already compromised in forensic terms," said Keir Giles, an associate fellow at the Chatham House think tank.
He said a reconstruction of the aircraft fuselage and wings would show how the missile struck the plane and what type it was.
"If any aircraft parts have already been removed ... this compromises the objectivity of the investigation," he said.
AP staff writer Laura Mills reported from Moscow and AP staff writer David McHugh contributed from Kiev.