A fire broke out early Sunday at a natural gas terminal in the Russian Baltic Sea port of Ust-Luga, the regional governor said.
The terminal, 110 kilometres (70 miles) west of St Petersburg near the Estonian border, is operated by Novatek, Russia's largest independent natural gas producer.
"No casualties as a result of a fire at Novatek's terminal in the port of Ust-Luga. Personnel were evacuated," Aleksandr Drozdenko, governor of Leningrad Oblast, posted on Telegram along with a short video showing a massive fire and smoke at a chemical complex.
"A high alert regime has been introduced in the Kingiseppsky district (which includes the port)," he said, noting that the blaze was "localised".
The Russian ministry of emergency situations and local fire service were involved in fighting the blaze, he added.
Local official Yuri Zapalatski said the fire started just before 02:45 am local time.
TASS news agency and other state media said the cause of the fire has not been announced.
Russia's Defence Ministry announced Sunday that Ukrainian attacks overnight had been foiled but made no mention of any incident in the Leningrad region.
The Ria-Novosti agency said a 100 cubic metre container was on fire.
The Ust-Luga complex processes natural gas condensate into naphtha, jet fuel and ship fuel components, according to Novatek's website.
The Nord Stream 2 gas pipeline leading to Germany, which has never entered into service after a sabotage raid in September 2022, starts from the town of Ust-Luga.