More than 12,000 people were evacuated in northern Ukraine on Tuesday morning after explosions resulted in a huge fire in an ammo depot, authorities said.
As reported by AFP, security services said they were investigating "possible sabotage" that could have caused the incident in a Defense Ministry warehouse, 135 km northeast of Kiev.
The emergency services said they had no information on casualties, while regional authorities said more than 60 people had received medical assistance.
A defense official said the fire had spread to five storage areas covering about 10 percent of the 700-hectare warehouse.
The fire and explosions began at around 3:30 am Tuesday at the Ministry of Defense, the emergency management agency said.
Four explosions took place in different parts of the warehouse before a fire broke out, the head of the Ukrainian General Staff, Rodion Timoshenko, said, suggesting that the incident could have been caused by "sabotage" in a tacit hint to Russia.
Since 2014, Kiev forces have been locked in a dispute with pro-Russian separatists in the east of the country that has claimed more than 10,000 lives.
The emergency management agency said more than 12,000 people had been evacuated from the area.
President Petro Poroshenko called for a meeting with security forces and promised all necessary assistance to citisens, his spokesman said on Facebook.