A Ukrainian military official has revealed that Russian forces are using kamikaze drones for cross-border attacks into the northeastern Sumy region of the country.

The portable, so-called kamikaze drones carry warheads and detonate on impact. They are small, disposable devices equipped with cameras and GPS that, when launched, locate nearby enemy assets and dive on command.

The town of Krasnopillya was shelled with mortars four times and bombarded with “kamikaze drones,” Dmytro Zhyvytskyy said Tuesday, according to CNN. Four people were wounded, he added.

“In general, the situation is quite tense. Yesterday, the communities and territories along the border were shelled with different kinds of armament: self-propelled artillery units, mortars, and MLRS.

“Shostka, another border town, was shelled with mortars and heavy artillery on Wednesday morning,” Zhyvytskyy said.