BBC Breakfast presenter Naga Munchetty ended an interview with a reporter in Kyiv following safety concerns when a loud bang was heard in the background.
Munchetty, 47, had been conducting an interview with Kyiv correspondent James Waterhouse when sounds were heard off-camera.
He was then interrupted by an earthquake-like rumble.
He said: “This is what is murky. See that’s not clear what that rumble was. We don’t really know what it sounds like.”
Quickly Munchetty intervened and she said it was best to cut short the interview for his own safety.
“I think what we should do is say goodbye at this moment in time just for your safety as well,” she said.
“James Waterhouse, thank you so much for the reporting you and the team are bringing us. Take care.”
It comes as Russian forces appeared to make progress from northeast Ukraine in their slow fight to reach the capital Kyiv.
Tanks and artillery pounded places already under siege with shelling so heavy it prevented residents of one city from burying the growing number of dead.
In Mariupol, unceasing barrages have thwarted repeated attempts to bring in food and water and to evacuate trapped civilians.
Mariupol’s death toll has passed 1,500 in 12 days of attack, the mayor’s office said.
A strike on a maternity hospital in the city of 446,000 this week that killed three people sparked international outrage and war-crime allegations.
