What to know

• Baltic states Lithuania, Latvia and Estonia — NATO members sharing a long border with Russia — regularly report drone incursions into their territories as part of Moscow's war with Ukraine.S1
• It is currently unknown where the drone came from, officials said.S2
• An emergency alert was sent to mobile phones shortly after midnight warning residents of a potential aerial threat - a drone was destroyed 30 minutes laterS3
• Origin yet to be determined; drone alert was issued earlier in ​the capital ‌Vilnius and surrounding region.S4