By Mick Krever, CNN

Bodies at the Ukrainian crash site of Malaysia Airlines Flight 17 are already “starting to partially decompose in the hot sun,” a member of the first investigative team to arrive at the scene told CNN’s Christiane Amanpour on Friday.

“It basically looks like one of the biggest, or the biggest, crime scenes in the world right now, guarded by a bunch of guys in uniform with heavy fire power, who are quite inhospitable,” Michael Bociurkiw, spokesman for the the Organization for Security and Co-operation in Europe’s special monitoring mission for Ukraine, said in an exclusive interview.

“We saw a lot of debris,” he said. “The debris doesn’t look like it’s been manipulated in any way, but there’s lots of it. The crash area is very, very big.”

The 25 workers from the OSCE were able to spend only about 75 minutes at the crash site before they were forced to leave.

Bociurkiw said, contrary to some earlier reports, his team was not fired upon by pro-Russia separatists who control the area where the plane was shot down, but “there was one shot fired at the end in the air, in the direction of some civilians. But we were not shot at.”

There seems to be very little operational control over the crash site.

“We asked for the commander, the leader – no one showed up. There was one gentleman there in a uniform, heavily armed, and apparently somewhat intoxicated.”

“There didn’t seem to be anyone really in control. For example, we – one of our top priorities was to find out what happened to the black boxes. No one was there to answer those questions.”

“We actually spoke to some civilian emergency workers and they said their job was just to mark where the bodies are.”

“And when we asked, well, ‘Then what happens?’ they said, ‘Well that’s somebody else’s job.’”

“But in terms of tampering of debris, it’s very hard to say. We plan to stay there for quite a bit longer.”

Bociurkiw told Amanpour his team would attempt to return to the site on Saturday.

“The perimeter is not secure whatsoever.”

“It’s very easy for anyone, really, to walk in there and tamper with evidence or debris. So a lot of work needs to be done. A lot of professional work needs to be done very, very quickly.”