Lithuania's president and prime minister were forced to take shelter on Tuesday, when a drone alert caused the capital Vilnius to come to a standstill.

President Gitanas Nauseda and Prime Minister Inga Ruginiene were taken to emergency shelters following the air alert, which ordered the city's population to take cover.

Flights were suspended and road and rail travel briefly ground to a halt. The alert has since been lifted. It is not yet clear who was behind the incursion.

It came a day after Estonia said Nato shot down a drone over its territory, which it suspected was a Ukrainian projectile knocked off course by Russian electronic interference.

It was the latest in a series of recent drone incursions over Nato members Estonia, Latvia and Lithuania.

An alert from Lithuania's defence ministry on Wednesday said: "Immediately take shelter in a safe place, take care of your close ones, await new recommendations."

Lithuania's national crisis management centre earlier said it had issued an alert in response to a drone in neighbouring Belarus that was seen flying towards Lithuania.

The drone's origin had not been confirmed, the centre added.

Lithuania's military later said Nato jets had been deployed to shoot down the drone but could not locate it.

An evacuation order was also issued at the Seimas, Lithuania's parliament, according to local media, with politicians and staff led down to a basement shelter.

On Tuesday, Estonian officials said a Nato fighter jet had shot down a suspected Ukrainian drone. No damage was reported.

Ukraine responded by accusing Moscow of deliberately redirecting Ukrainian drones launched at "legitimate military targets" in Russia and apologising to "Estonia and all of our Baltic friends for such unintended incidents".

Last week, Latvian Prime Minister Evika Silina resigned after a political crisis over Russia-bound Ukrainian drones straying into Latvian territory.

Earlier this month, two Ukrainian drones hit an empty oil storage site in Latvia. Ukraine said this was the result of electronic jamming by Russia.

A similar incident was reported by Estonia and Latvia in March.

Moscow has accused the three Baltic states of allowing Ukraine to use their "air corridors" to strike targets inside Russia - a claim which has been denied by Tallinn, Riga and Vilnius.

Ukraine has recently intensified its drone and missile attacks against targets in Russia, including oil and gas facilities near the Baltic states.

Russian President Vladimir Putin launched a full-scale invasion of Ukraine in 2022.

Kremlin spokesman Dmitry Peskov on Wednesday said the Russian military was closely monitoring instances of drones flying through the Baltic states' airspace, and is formulating an appropriate response, Russian state news agency TASS reported.

The change reflects increasing supply concerns over certain fuels due to the effective blockade of the Strait of Hormuz.

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Ukraine's president says the strikes are a "justified" response to deadly Russian attacks on Ukrainian cities.

Among the victims in Kyiv was 12-year-old Lyubava Yakovleva, whose father was killed during the war.