Two explosions rocked the Belgorod region in southern Russia in the early hours of Monday, the region’s governor said, in the latest sign of the war in Ukraine that could spill over into Russia.

“I woke up 30 minutes ago after two strong explosions,” Vyacheslav Gladkov wrote on his Telegram messaging channel, adding that there were no casualties or damage from the blasts.

On Sunday, Mr Gladkov said a fire broke out at a Defense Ministry facility in the area. One person was injured and seven houses damaged in the incident, he said.

Russia has accused Ukraine of sporadic attacks and acts of sabotage on its territory in recent weeks. Kyiv has either denied responsibility or declined to comment on the accusations.

On Sunday, Roman Starovoit, the regional governor of Russia’s Kursk region, said the partial collapse of a railway bridge was an act of sabotage.

“Law enforcement specialists will investigate further,” Starovoit said on Telegram, adding that there were no casualties.

The Russian Defense Ministry did not immediately comment on the incident.

There have been at least two other explosions in recent days and a fire on Sunday at an oil depot in the Russian city of Bryansk, also close to the Ukrainian border.