A drone attack on an ammunition depot in Crimea has led to civilian evacuations and disrupted transport according to Russian authorities.
Sergei Aksyonov, the Russian-installed governor of occupied Crimea, said Ukraine was behind the attack, without providing evidence.
Mr Aksyonov said local residents living within five kilometres of the blast were being evacuated.
Rail services across the Kerch bridge have also reportedly been halted.
Earlier on Saturday, Russian authorities stopped traffic on the bridge, but then swiftly reopened it to cars.
A later update from the Moscow-installed government said road traffic was again halted until further notice.
The district where the strike was reported is more than 160km (100 miles) from the Kerch bridge.
The bridge, often referred to as the Crimea bridge, was opened in 2018 enabling road and rail access between Russia and Crimea – Ukrainian territory annexed by Moscow in 2014.
It has become a symbol of Russian occupation and is also an important re-supply route for Russian forces in southern Ukraine.
On Monday, a blast on the bridge killed two people and damaged the road but the railway line, which runs parallel to it, was not damaged.
Ukrainian President Volodymyr Zelensky has said the Crimea bridge is a legitimate target.
Speaking on Friday he spoke of the need to “neutralise” the bridge, explaining it was “the route used to feed the war with ammunition and this is being done on a daily basis” and that Kyiv sees it as “an enemy facility”.
“So, understandably, this is a target for us,” Mr Zelensky said, in a video address to the Aspen security conference in the US.
Monday’s alleged attack was the second major incident on the Kerch bridge in the past year.
In October 2022, the bridge was partially closed following a huge explosion. It was fully reopened in February.