Police in Aberdeen and Inverness say they have been receiving a large number of calls about a big, bright flash seen in the sky over Scotland.
People have taken to social media to report seeing a blue, white or green light, with some saying they also heard a rumbling sound.
There is speculation it could have been a meteor or may have been a sonic boom.
Some reports suggested the light may have been seen as far south as Berwickshire in the Scottish Borders.
Jenni Morrison captured dash-cam footage of the flash as she drove on the A944 between Westhill in Aberdeenshire at about 18:45.
She said: “It was absolutely weird. The sky lit up.”
Garry J Hunter contacted BBC Scotland to say he had seen the flash over Lumphanan in Aberdeenshire. He described it as “a huge fireball-like trail across the sky, which seemed to then explode and light up the whole sky”.
Val Hamilton from Nethy Bridge said she saw the sky light up south west of Aviemore at about 18:45.
“I saw a white ball with a tail passing through the sky at great speed. It was very dramatic,” she said.
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