Two people were killed in a Ukrainian drone strike in the southern Samara region early Thursday morning, local authorities said, with media reports suggesting a nearby oil refinery was targeted.

Samara region Governor Vyacheslav Fedorishchev said the city of Syzran, which is home to a Rosneft-operated oil refinery, came under attack early in the morning.

“I am deeply saddened to report that two people have lost their lives due to these inhumane actions by the enemy,” Fedorishchev wrote in a post on Telegram. He said several others were injured.

Unconfirmed media reports suggested that a Ukrainian drone struck the Syzran Oil Refinery. Videos circulating on social media purportedly showed smoke rising from the facility after the attack.

Authorities have not commented on those reports.