Human rights journalist Sara Cincurova slammed the United Nations’ Office for Coordination of Humanitarian Affairs Thursday after she said the agency abandoned her on a train in Ukraine amid Russia’s full-scale invasion of the country.

"I’m a freelance reporter and was invited as a guest to a press trip you organized for me in Kramatorsk and confirmed at 8 p.m. yesterday," she tweeted Thursday. "At 5:54, while I was on the night train, you cancelled my trip by WhatsApp and told me you will not even pick me up!"

She said she was left alone, without body armor, and told it was up to her where to disembark from the train "while hostilities were going on all around." Her whereabouts could not immediately be independently confirmed.

RUSSIA INVADES UKRAINE: LIVE UPDATES

Spokespersons for the U.N.'s Office for Coordination of Humanitarian Affairs did not immediately respond to requests for comment on the situation.

Cincurova said she got off "in the middle of nowhere" and found another train headed to Kharkiv, about 300 miles east of Kyiv, near the border with Russia. The city is also more than 120 miles from where she said she was supposed to rendezvous for the U.N. press trip. She did not immediately respond to messages seeking comment.

Ukrainian servicemen

Ukrainian servicemen are seen next to a destroyed armored vehicle, which they said belongs to the Russian army, outside Kharkiv, Ukraine, Feb. 24, 2022.  (REUTERS/Maksim Levin )

"I demand you evacuate me safely," she wrote in a tweet directed at the U.N.'s Ukraine offices. "Not only should you provide help to human rights defenders, you should not abandon them alone in the middle of a warzone."

The Ukrainian government released images that show Kharkiv saw an explosion of violence Thursday, with disabled vehicles blocking the streets and the body of a man identified as a Russian soldier near the smoldering husk of a damaged tank.

UKRAINE-RUSSIA WAR: WHAT TRIGGERED PUTIN AND WHAT MAY HAPPEN NEXT

Cincurova, a native of Slovakia, became a self-trained journalist in her mid- to late-20s and quickly began covering international human rights news, according to Nate Carlisle, a Utah-based investigative reporter who mentored Cincurova last year.

"She’s in a hotel with other freelance journalists, trying to figure out how to go back to Slovakia," Carlisle told Fox News Digital Thursday. "[There’s] no easy answer at this moment, given the airports aren’t flying. There are trains, it sounds like, but it’s not clear to me how often they’re running, if there are seats available."

And from where Cincurova is sheltering, he said, the only trains available may be running only to Kyiv, the Ukrainian capital where explosions could be heard throughout the day.

Ukraine Soldier military village

A Ukrainian soldier passes by houses in the village of Novoluhanske, Luhansk region, Ukraine, Saturday, Feb. 19, 2022.  (AP Photo/Oleksandr Ratushniak)

RUSSIA CRACKS DOWN ON ANTI-WAR PROTESTS, MORE THAN 1,700 DEMONSTRATORS ARRESTED

Ukrainian health officials said at least 137 people had been killed in the first day of Russia’s invasion, and at least 300 more were wounded.

Carlisle said he spoke to Cincurova earlier Thursday and that she said she was "safe for the moment."

"As safe as anyone in Kharkiv is," he said. 

As of Thursday afternoon, it remained unclear whether the other trapped journalists were also part of the U.N. press trip.

Carlisle said he met Cincurova through a State Department-sponsored mentorship and cultural exchange program last year that paired a half dozen journalists in Utah with foreign reporters.

He described her as "very intelligent" and an eager learner and said she broke into the industry on her own without formal training.

"Very quickly, she was covering some of the refugee crises from North Africa, going across the sea to Europe and America," Carlisle said. 
 

Ukrainian servicemen

Ukrainian servicemen sit atop armored personnel carriers traveling on a road in the Donetsk region, eastern Ukraine, Thursday, Feb. 24, 2022. Russian President Vladimir Putin on Thursday announced a military operation in Ukraine and warned other countries that any attempt to interfere with the Russian action would lead to "consequences you have never seen."  (AP Photo/Vadim Ghirda)

CLICK HERE TO GET THE FOX NEWS APP

A veteran investigative journalist, Carlisle said he helped train Cincurova how to mine government documents for newsworthy information.

Russia launched a full-scale invasion overnight Wednesday, prompting new sanctions from the U.S. and allies. President Biden announced Thursday afternoon that 7,000 additional American troops would deploy to Germany.

But Biden declined to answer questions about why the sanctions did not target the personal wealth of Russia’s leader, Vladimir Putin, or commit to cutting Russia off from the Society for Worldwide Interbank Financial Telecommunication, or SWIFT, the world’s main international banking network.