Lithuanian army to investigate anti-Lukashenko stunt by Swedish activists in Belarus

"We are looking into whether such an incident related to violation of flight regulations took place," Captain Skomantas Povilionis, spokesman for the Chief of Defense of Lithuania, told BNS.

English language Swedish news website thelocal.se reported earlier that hundreds of pro-free speech teddy bears carried in the plane piloted by Swedes parachuted down on the Belorussian President Alexander Lukashenko's palace in Minsk early Wednesday morning in a show of support for the country's pro-democracy movement.

But the Belorussian Defense Ministry told Interfax on Wednesday no unauthorized foreign aircraft crossed the Belorussian air border on 4 July.

"No instances of violation by foreign aircraft of the Belorussian national border have been registered today. There has been no border violation in the Belarusian airspace over the past 24 hours. All flight itineraries have been tracked. Over the past 24 hours, on-duty air defense forces have passed over 1,000 aircraft," the Defense Ministry said.

According to thelocal.se, the action was orchestrated by Studio Total, a Swedish PR firm with a history of high-profile and sometimes deceptive publicity stunts.

"We were over Belarus for about an hour and twenty minutes. I don't know if anyone reported us. We were flying very low," thelocal.se quoted the pilot.

According to the report, the plane took off in and went back to Lithuania. However, three current Minsk residents who live in the vicinity of the presidential palace said they had not seen or heard any low-flying aircraft on Wednesday morning.