A bomb has struck the headquarters of a Catholic diocese on Tuesday in the besieged Ukrainian city of Kharkiv.

Forty people were sheltering in the basement of the diocesan chancery when the bomb landed, but no injuries were reported, the Italian news agency SIR said.

A video posted on Twitter by the Latin Mass Society of England and Wales showed debris strewn across the floor of a upper room in the chancery.

Russian forces have advanced on Kharkiv, which has a population of 1.4 million people, since President Vladimir Putin ordered a full-scale invasion of Ukraine on Feb. 24.