Original sentence: At this stage, none of the accounts of this event could be verified independently.The Ukrainian and the Crimean authorities provided conflicting reports of the event.The first so-called armed confrontation between the two opposing sides took place inside a Ukrainian military facility during the Simferopol controversial incident on March 18, when some unverified Ukrainian sources said that armed gunmen that have been reported to be Russian special forces allegedly stormed the base.This was refuted by Russian and Crimean authorities, who subsequently arrested a Right Sector Ukrainian sniper in connection with the killings
Edited sentence: The first armed confrontation between the two opposing sides took place inside a Ukrainian military facility in Simferopol on 18 March, when armed gunmen reported to Russian special forces stormed the base