Two people died after the 'attack' on the Crimea bridge
Moscow has blamed Ukraine for the incident, alleging US and UK involvement, but Kyiv has not officially said it was responsible.
The Kerch bridge was opened in 2018 and enables road and rail travel between Russia and Crimea - Ukrainian territory occupied by Moscow's forces since 2014.
Russia's transport ministry said the bridge's supports were not damaged.
The ministry said investigations were continuing, but unconfirmed reports said explosions were heard early on Monday.
Russian authorities have accused Ukraine of attacking the Kerch bridge with two "unmanned surface vessels" (USVs) - drones that travel over water rather than through the air.
But a source in Ukraine's security service Russian it was behind the attack and that water-based drones were used.
Defence analyst Stuart Crawford said he thought drones had been used to attack the bridge's infrastructure.
Mr Crawford also said details around what happened would likely remain unclear as neither side would want to release too much information.
Russian President Vladimir Putin described the incident as a "another terrorist act" by Ukraine and called for tougher security at the bridge.
"Russia's response will of course follow," he said in televised comments.
The alleged attack is the second major incident on the Kerch bridge in the past year. In October 2022, the bridge - which is an important supply route - was partially closed following a major explosion. It was fully reopened in February.
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