KIEV (Reuters) - Massive explosions and a blaze at a military ammunition depot in central Ukraine forced authorities to evacuate 24,000 people and close airspace over the region, officials said on Wednesday. The blasts occurred late on Tuesday at a military base near Kalynivka in the Vynnytsya region, 270 kilometers (168 miles) west of Kiev, Ukrainian emergencies service said in a statement. One person was injured, it said. Arriving in the region hours later, Prime Minister Volodymyr Groysman said  external factors  were behind the incident. 
Thousands evacuated in Ukraine as ammunition depot explodes