Ukraine has denied involvement in the killing of Daria Dugina, chief editor of a Russian disinformation website who was herself under U.S. sanctions.

The U.S. says it will give Ukraine 15 Scan Eagle surveillance drones, 40 mine-resistant vehicles, 2,000 anti-armor rounds and howitzer weapons to help Ukrainian forces regain territory and mount a counter-offensive against Russian invaders.

It wasn’t clear whether the munitions were accidentally ignited or were hit by a Ukraine missile.

Russia and its rebel allies are holding an estimated 1,000 Azov fighters prisoner, many since their surrender at the steelworks in mid-May.

The attack on Dnipro came a day after a Russian missile strike killed at least 23 people and wounded more than 200 in Vinnytsia, a city southwest of Kyiv, the capital.

Officials said Kalibr cruise missiles fired from a Russian submarine in the Black Sea struck civilian buildings in Vinnytsia, 167 miles southwest of Kyiv.