This is the best summary I could come up with:

Sept 19 (Reuters) - Evidence suggests a deadly explosion at a busy market in the eastern Ukrainian city of Kostiantynivka this month was caused by an errant missile fired by Ukraine, the New York Times reported on Tuesday.

"Evidence collected and analyzed by The New York Times, including missile fragments, satellite imagery, witness accounts and social media posts, strongly suggests the catastrophic strike was the result of an errant Ukrainian air defense missile fired by a Buk launch system," the newspaper reported.

It quoted air defence experts as saying missiles such as the one that hit Kostiantynivka can go off course for a variety of reasons, including an electronic malfunction or having a guidance fin that is damaged or sheared off during launch.

The New York Times also cited evidence showing that minutes before the strike, the Ukrainian military had launched two surface-to-air missiles towards the Russian front line from the town of Druzhkivka, 10 miles (16 km) northwest of Kostiantynivka.

The newspaper said measurements of holes caused by the explosion and fragments found at the scene were consistent with the 9M38 missile, which is fired by the mobile Buk anti-aircraft vehicle.

The New York Times quoted a spokesperson for Ukraine's armed forces as saying the country's security service was investigating the incident, and under national law could not comment further.

The original article contains 353 words, the summary contains 221 words. Saved 37%. I'm a bot and I'm open source!