Drivers have been asked to keep calm and follow the instructions of transport security officers
Traffic on the main bridge linking mainland Russia with the Crimean Peninsula was suspended early on Tuesday, the operator of the bridge said on the Telegram messaging app.
The administration did not disclose the reason for the suspension.
Kiev has stepped up rocket and drone attacks on Crimea in recent months.
In October, several dozen Ukrainian drones were spotted and destroyed over the Black Sea and the northwestern part of the Crimean Peninsula, the Russian military said.
On September 13, Ukraine struck a shipyard in Sevastopol with cruise missiles, damaging two naval vessels, according to the Russian military. Nine days later, a missile struck the headquarters of the Black Sea Fleet in Sevastopol.
Ukraine has also used sea drones to attack Russian port infrastructure in Sevastopol on multiple occasions. Maritime drones targeted key transport infrastructure, including the 19km Crimean Bridge, which was badly damaged in an attack in July but repaired and fully reopened in October.
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